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

int main(int argc, char *argv[])
{
  int c,m=5,b='a';
  int a,k=0;
  while((c=getchar())!=-1)
  {
    a=(26+(c-b)-m)%26;
    printf("%c",a+b);
    m=c-b;
  }
  return 0;
}

i've got an WA#1...

Edited by author 04.11.2011 21:08