#include <iostream>

int main(void){
  using namespace std;
  string a;
  int x;
  cin >> a;
  const char* ca = a.c_str();
  for(int i=0;i<a.length();i++){
    if((int)ca[i]-(i%26)-1<=64) x=(int)ca[i]-(i%26)-1+26;
    //if((int)ca[i]-(i%26)-1==64) x=90;
    else x=(int)ca[i]-(i%26)-1;
    cout << (char)x;
    //cout << x;
  }
  return 0;    
}