#include <stdio.h>
#include <stdlib.h>


int main(int argc, char *argv[]) {
  
 
  char a, b, c, d, e, f;

  a = 'a';
  b = 'b';
  c = 'c';
  d = 'd';
  e = 'e';
  f = 'f';

  f = (a += 12) + (b += 15) - (c += 7) - (d = e+8) + 'm';
  
  if (f > 'v') {
    a -= 12;
    b -= 10;
    c -= 8;
    d -= 6;
    e -= 4;
    f -= 2;
  }
  else {
    a -= 6;
    b -= 5;
    c -= 4;
    d -= 3;
    e -= 2;
    f -= 1;
  }
  
  printf("%c%c%c%c%c%c\n", a, b, c, d, e, f);

  return 0;
}