#include <stdio.h>

int main(){
  char s[1024];
  int i, as;
  char c;

  int n = 0;
  for(i = 0; (c = getchar()) != '\n' ; i++){
	  s[i] = c;
      as = (s[i] - 65 - (i+1))%26;
    if(as < 0){
      s[i] = as + 26 + 65;
    }else{
      s[i] = as + 65;
    }
    n++;
  }
  s[n] = '\0';
  printf("%s\n",s);
  return 0;

}