#include <bits/stdc++.h>
using namespace std;

char prev_alp (char c, int n) {
    while (n--) {
        if (c == 'A') c = 'Z';
        else c--;
    }
    return c;
}

int main() {
    string s;
    cin >> s;
    
    const int n = s.length();
    for (int i = 0; i < n; i++) {
        s[i] = prev_alp(s[i], i + 1);
    }
    
    cout << s << '\n';
    return 0;
}