#include <iostream>
#include <vector>
#include <algorithm>

#define FORR(i,b,e) for(int i=(b);i<(int)(e);++i)
#define FOR(i,e) FORR(i,0,e)
#define dump(var) cerr << #var ": " << var << "\n"
#define dumpc(con) for(auto& e: con) cerr << e << " "; cerr<<"\n"

typedef long long ll;
typedef unsigned long long ull;

const double EPS = 1e-6;
const int d4[] = {0, -1, 0, 1, 0};

using namespace std;


int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);

    string S;
    cin >> S;
    int w = 'Z'-'A'+1;
    FOR(i, S.size()) {
        cout << (char)((S[i]+w*100-i-1-'A') % w + 'A');
    }
    cout << endl;

    return 0;
}