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

int main(void){
  int length;
  char string;
  for(int i = 0; i < 100; i++){
    string = getchar();
    if(string == '\n'){
      length = i;
      break;
    }
    string -= i  + 1;
    if(i > 52)i -= 26;
    while(string < 'A')string += 26;
    while(string > 'Z')string -= 26;
    putchar(string);
  }
  putchar('\n');
  return 0;
}