#include<stdio.h>

int main(void){
  int i;
  char str[1024];

  scanf("%s", str);

  for(i = 0; str[i] != '\0'; i++){
    if(str[i] - (i+1) < 'A'){
      str[i] = 'Z' - ('A' + (i+1) - str[i] - 1) % 26;
    }
    else str[i] = str[i] - (i+1);
  }
  printf("%s\n", str);
  return 0;
}