#include <iostream>
using namespace std;

int main(){
  string alpha = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
  string str;
  cin >> str;
  int n = str.size();
  for(int i = 0; i < n; i++)
    cout << alpha[(((str[i] - 'A') - (i + 1)) + 2600000) % 26];
  cout << endl;
}