Data una lista di IP (separati dal carattere "#"), occorre trovare quante macchine diverse con indirizzo IP appartenente alla famiglia 231.???.232.??? compaiono nella lista.

Note:

i quattro numeri che compongono un indirizzo IP sono interi compresi fra 0 e 255
i tre punti interrogativi possono rappresentare tre, due o anche una sola cifra.
ogni macchina va contata una volta sola, anche se compare più volte.
la sequenza va a capo solo per leggibilità.

Esempio:
La seguente lista di IP:

231.144.231.206#232.122.232.228#233.190.231.219#233.131.231.4#231.93.231.43#
233.114.231.2#231.96.232.146#232.155.231.169#232.90.231.155#231.232.231.77#
233.185.233.236#231.37.232.60#231.96.232.146#232.155.231.169#232.90.231.155#
231.232.231.77#

contiene due macchine diverse della famiglia desiderata:

la macchina con indirizzo IP 231.96.232.146 compare due volte,
la macchina con indirizzo IP 231.37.232.60 compare una volta sola.

La risposta al quesito è il numero di macchine diverse con indirizzo IP appartenente alla famiglia desiderata che compaiono nella lista seguente.

233.56.40.151#231.126.232.12#231.81.232.32#231.84.232.216#67.51.103.170#
141.239.8.27#231.205.232.13#231.105.232.78#16.9.83.52#231.8.232.253#
243.214.85.12#241.40.56.119#214.40.31.158#231.81.232.179#27.41.70.190#
231.216.232.212#124.62.5.212#231.215.232.141#231.118.232.134#151.155.179.10#
231.18.232.69#246.55.219.145#231.229.232.70#241.142.5.164#231.1.232.93#
231.216.232.212#252.177.53.157#231.67.232.195#231.136.232.6#231.84.232.216#
194.89.56.29#231.227.232.211#222.251.125.215#41.160.200.111#231.173.232.196#
231.215.232.141#231.185.232.171#231.151.232.159#231.239.232.231#231.238.232.98#
231.111.232.251#231.126.232.12#231.185.232.171#231.81.232.179#95.113.31.43#
231.4.232.61#162.20.34.65#241.40.56.119#231.67.232.195#231.228.232.191#
46.244.166.64#231.227.232.211#36.134.178.94#231.42.232.188#231.42.232.188#
231.185.232.171#231.215.232.141#231.228.232.191#231.63.232.124#231.205.232.13#
231.233.232.45#231.106.232.23#231.70.232.161#231.226.232.132#231.215.232.141#
231.54.232.12#193.159.243.64#235.110.37.131#231.106.232.174#125.147.122.91#
231.185.232.131#231.18.232.69#187.135.78.146#231.216.232.212#231.150.232.175#
231.111.232.251#229.41.234.147#231.118.232.134#231.227.232.211#20.229.213.217#
231.216.232.212#231.54.232.12#149.99.163.218#231.18.232.69#231.8.232.253#
231.42.232.188#231.126.232.12#231.81.232.32#231.136.232.6#231.84.232.216#
231.106.232.119#231.132.232.91#231.106.232.119#231.81.232.179#231.126.232.12#
245.202.31.148#231.63.232.124#231.228.232.191#231.70.232.161#231.106.232.23#
231.228.232.191#79.247.8.250#231.151.232.159#171.234.114.181#231.135.232.137#
231.106.232.174#231.228.232.191#105.206.174.131#231.54.232.12#231.63.232.124#
231.226.232.132#231.193.232.135#231.205.232.13#231.84.232.216#95.113.31.43#
231.8.232.253#95.49.239.18#176.113.32.98#231.166.232.60#217.246.112.180#
231.233.232.45#231.42.232.188#231.136.232.6#231.238.232.98#231.18.232.69#
231.151.232.159#231.192.232.232#231.1.232.93#231.239.232.231#20.229.213.217#
231.167.232.17#189.118.234.112#176.113.32.98#123.111.0.48#231.122.232.242#
231.105.232.78#231.4.232.61#231.118.232.134#254.178.76.96#231.18.232.69#
2.62.112.113#103.184.26.95#231.205.232.13#94.177.2.193#231.128.232.146#
231.8.232.68#231.1.232.93#231.84.232.216#231.54.232.12#231.205.232.13#
231.70.232.161#37.189.33.94#231.105.232.78#231.151.232.159#231.188.232.59#
149.99.163.218#231.81.232.32#231.185.232.171#231.98.232.161#214.239.92.61#
231.106.232.23#231.1.232.93#231.105.232.78#231.239.232.231#233.56.40.151#
231.227.232.211#230.225.23.132#231.0.232.176#231.1.232.93#231.167.232.17#
229.79.9.247#133.24.18.106#82.238.173.29#231.151.232.159#231.8.232.68#
231.233.232.197#116.21.147.102#115.191.92.104#26.161.186.79#231.215.232.141#
231.8.232.68#231.185.232.131#7.62.178.114#231.135.232.137#231.193.232.135#
231.166.232.60#231.229.232.70#231.239.232.231#12.30.148.5#231.132.232.91#
231.70.232.161#178.139.41.135#231.135.232.137#231.238.232.98#231.205.232.13#
231.1.232.93#231.205.232.13#179.172.20.67#40.52.70.109#231.233.232.197#
231.105.232.78#231.239.232.231#231.98.232.161#231.233.232.45#231.18.232.69#
231.229.232.70#144.120.51.232#231.135.232.137#51.131.227.137#127.204.183.186#
231.54.232.12#231.84.232.216#97.146.146.134#231.185.232.131#231.233.232.45#
231.216.232.212#5.22.51.195#231.70.232.161#231.1.232.93#231.173.232.196#
221.96.213.170#231.132.232.91#39.36.205.181#98.152.25.111#231.205.232.13#
231.23.232.129#231.233.232.45#144.36.224.41#231.128.232.146#231.54.232.12#
231.0.232.176#231.229.232.70#231.192.232.232#231.185.232.131#231.215.232.141#
70.117.200.220#231.15.232.98#231.18.232.69#97.182.180.200#231.23.232.129#
231.4.232.61#231.4.232.61#126.240.20.174#231.132.232.91#231.81.232.32#
31.18.67.225#231.81.232.179#127.85.74.122#231.185.232.131#231.136.232.6#
231.128.232.146#231.63.232.124#229.41.234.147#231.192.232.232#94.127.248.229#
171.209.195.150#231.135.232.137#245.202.31.148#214.190.160.50#231.84.232.216#
13.82.170.112#231.226.232.132#98.152.25.111#231.8.232.253#231.166.232.60#
231.185.232.131#12.106.91.251#231.42.232.188#231.238.232.98#231.70.232.161#
20.64.239.111#231.122.232.242#172.166.76.43#19.193.191.209#231.8.232.253#
231.216.232.212#161.230.33.63#231.128.232.146#231.166.232.60#231.228.232.191#
214.40.31.158#231.15.232.98#231.67.232.195#231.193.232.135#231.81.232.32#
178.150.38.126#227.23.37.41#231.68.232.252#231.1.232.93#231.192.232.232#
231.106.232.23#231.227.232.211#147.129.93.131#231.70.232.161#178.150.38.126#
231.106.232.174#231.122.232.242#231.173.232.196#231.126.232.12#171.106.235.184#
231.118.232.134#231.42.232.188#231.233.232.197#231.67.232.195#67.51.103.170#
231.18.232.69#231.167.232.17#208.196.59.42#141.239.8.27#153.108.208.67#
231.70.232.161#231.68.232.252#231.193.232.135#231.126.232.12#59.203.0.99#
231.106.232.119#231.23.232.129#238.8.174.124#108.51.214.213#231.193.232.135#
231.8.232.68#231.216.232.212#249.176.172.150#231.132.232.91#231.227.232.211#
231.98.232.161#231.15.232.98#231.166.232.60#231.188.232.59#231.166.232.60#
241.40.56.119#231.18.232.69#231.111.232.251#107.150.240.36#231.167.232.17#
34.49.192.252#176.113.32.98#119.50.165.117#231.173.232.196#231.135.232.137#
231.167.232.17#231.81.232.179#231.118.232.134#134.99.205.71#231.227.232.211#
231.111.232.251#208.196.59.42#231.227.232.211#231.128.232.146#245.202.31.148#
231.185.232.131#123.61.219.232#231.205.232.13#241.40.56.119#231.188.232.59#
113.185.95.67#178.128.24.104#150.219.16.235#231.215.232.141#231.192.232.232#
231.1.232.93#98.152.25.111#197.211.225.0#231.239.232.231#231.105.232.78#
231.227.232.211#144.36.224.41#231.4.232.61#231.233.232.45#251.216.149.252#
231.216.232.212#231.1.232.93#200.14.240.40#231.54.232.12#231.193.232.135#
187.135.78.146#231.68.232.252#231.188.232.59#147.73.84.116#231.105.232.78#
231.193.232.135#80.112.24.186#70.117.200.220#231.192.232.232#231.188.232.59#
164.69.62.45#231.8.232.68#231.135.232.137#231.0.232.176#108.242.182.246#
231.166.232.60#231.8.232.68#149.99.163.218#116.21.147.102#20.64.239.111#
231.128.232.146#231.23.232.129#231.0.232.176#231.54.232.12#1.60.58.86#
106.99.240.194#144.120.51.232#231.193.232.135#231.8.232.68#231.118.232.134#
231.188.232.59#231.98.232.161#231.81.232.32#231.136.232.6#150.162.75.215#
231.111.232.251#231.227.232.211#231.233.232.45#231.132.232.91#133.168.2.175#
231.68.232.252#161.230.33.63#157.176.139.255#39.36.205.181#231.54.232.12#
150.162.75.215#231.18.232.69#231.8.232.68#231.185.232.131#231.239.232.231#
231.193.232.135#231.150.232.175#123.61.219.232#231.105.232.78#231.173.232.196#
231.23.232.129#231.173.232.196#2.62.112.113#179.64.249.146#231.132.232.91#
231.239.232.231#194.89.56.29#231.238.232.98#230.225.23.132#231.4.232.61#
231.188.232.59#231.106.232.23#231.4.232.61#231.167.232.17#231.8.232.68#
231.42.232.188#231.233.232.197#231.215.232.141#231.167.232.17#231.193.232.135#
133.168.2.175#231.192.232.232#231.215.232.141#231.229.232.70#231.185.232.171#
8.71.167.128#231.205.232.13#231.150.232.175#231.54.232.12#203.132.31.82#
40.52.70.109#231.167.232.17#231.233.232.45#179.66.110.65#231.84.232.216#
178.150.38.126#231.67.232.195#231.216.232.212#231.0.232.176#231.173.232.196#
251.216.149.252#231.239.232.231#231.238.232.98#32.144.211.246#231.8.232.68#
184.74.241.42#231.151.232.159#179.64.249.146#188.208.171.111#225.60.84.160#
231.15.232.98#231.8.232.253#151.166.255.89#231.42.232.188#102.99.248.84#
231.229.232.70#231.227.232.211#231.111.232.251#231.192.232.232#231.4.232.61#
231.192.232.232#178.128.24.104#231.15.232.98#231.8.232.253#231.166.232.60#
31.184.197.13#231.188.232.59#153.108.208.67#231.15.232.98#231.185.232.131#
192.238.6.19#231.151.232.159#124.20.41.189#192.155.30.38#231.185.232.171#
124.20.41.189#28.39.97.73#41.181.55.150#231.4.232.61#132.14.208.138#
231.98.232.161#231.98.232.161#100.58.162.81#37.8.235.125#231.239.232.231#
231.106.232.119#171.169.133.132#108.51.214.213#117.249.189.214#231.216.232.212#
31.18.67.225#231.106.232.23#252.177.53.157#235.14.178.15#231.81.232.32#
231.151.232.159#231.188.232.59#231.173.232.196#184.74.241.42#231.192.232.232#
231.188.232.59#8.71.167.128#184.74.241.42#113.123.119.65#231.23.232.129#
32.144.211.246#203.48.38.153#231.81.232.32#231.67.232.195#231.118.232.134#
231.173.232.196#222.214.174.212#231.216.232.212#231.227.232.211#32.89.118.115#
231.215.232.141#178.139.41.135#231.188.232.59#100.58.162.81#159.241.137.152#
193.159.243.64#235.14.178.15#231.216.232.212#50.40.100.249#231.54.232.12#
88.196.219.210#231.135.232.137#231.42.232.188#231.122.232.242#231.192.232.232#
177.81.20.45#231.185.232.171#198.192.48.38#231.70.232.161#231.105.232.78#
231.150.232.175#231.81.232.179#231.105.232.78#231.215.232.141#231.136.232.6#
231.105.232.78#231.15.232.98#231.188.232.59#231.151.232.159#231.68.232.252#
231.84.232.216#231.54.232.12#231.98.232.161#127.18.26.171#231.81.232.32#
231.226.232.132#231.1.232.93#55.209.81.244#192.155.30.38#71.155.197.110#
51.131.227.137#231.128.232.146#117.249.189.214#231.98.232.161#231.106.232.174#
231.173.232.196#178.128.24.104#231.205.232.13#231.111.232.251#28.39.97.73#
231.166.232.60#80.112.24.186#237.176.255.213#231.15.232.98#231.54.232.12#