#include <stdio.h>

int main(void)
{
  char s[1025] = {}, j = 1;
  scanf("%s", s);
  for(short i = 0; s[i]; i++){
    s[i] -= j;
    if(s[i] < 65)
      s[i] += 26 ;
    j++;
    if(j == 27)
      j = 1;
  }
  printf("%s\n", s);
}