#include <stdio.h>
#define SS 1026 //SS = StringSize

int main(void){
  int length;
  char string[SS];
  for(int i = 0; i < SS; i++){
    string[i] = getchar();
    if(string[i] == '\n'){
      length = i;
      break;
    }
    string[i] -= i  + 1;
    while(string[i] < 'A')string[i] += 26;
  }
  for(int i = 0; i < length; i++)putchar(string[i]);
  putchar('\n');
  return 0;
}