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

int main() {
  string str;
  string output;
  cin >> str;
  for (int i = 0; i < str.length(); i++) {
    if (str[i] - ((i + 1) % 26) >= 'A') {
      output += str[i] - ((i + 1) % 26);
    } else {
      output += 'Z' - 'A' + str[i] - i % 26;
    }
  }
  cout << output << endl;
}