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

#define dump(x) cout << (x) << '\n'
#define Int int64_t
#define fi first
#define se second
#define all(x) (x).begin(), (x).end()

Int INF = 1e18;
int inf = 1e9;
Int mod = 1e9+7;

int main() {
    string s;
    cin >> s;
    for (Int i = 0; i < (Int)s.size(); i++) {
        Int add = s[i] - 'A';
        add = (add - (i + 1) + 26000) % 26;
        cout << (char)('A' + add);
    }
    cout << endl;
    return 0;
}