#include <vector>
#include <queue>
#include <deque>
#include <stack>
#include <algorithm>
#include <functional>
#include <iostream>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <ctime>
#include <cctype>
#include <string>

using namespace std;

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