#include <iostream>
#include <vector>
#include <string>
using namespace std;

int main() {
  string s;
  cin >> s;
  vector<char> v;
  for (int i = 0; i < s.size(); ++i) {
    char  tmp = s[i] - (i + 1) % 26;
    v.push_back(tmp >= 'A' ? tmp : 'Z'- ('A' - tmp) + 1);
  }
  for (auto itr = v.begin(); itr != v.end(); ++itr) {
    cout << *itr;
  }
  cout << endl;
  return 0;
}