#include <iostream>
using namespace std;

int main(){
  string s;
  while(cin >> s){
    for(int i = 0; i < s.size(); i++){
      int add = ((i + 1) / 26 + 1) * 26;

      int pos = (s[i] - 'A' - (i + 1) + add) % 26;
      cout << (char)('A' + pos);
    }
    cout << endl;
  }
}