#include <algorithm>
#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <map>
#include <queue>
#include <set>
#include <string>
#include <vector>
using namespace std;
typedef pair<int, int> pii;
#define rep(i,x) for(int i=0;i<(int)(x);++i)

int main(){
    string s, out = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    cin >> s;
    rep(i, s.size()) {
        if (i%26 - (s[i] - 'A') + 1 > 0) {
            cout << out[25 - (i%26 - (s[i] - 'A'))];
        } else {
            cout << out[s[i] - 'A' - i%26 - 1];
        }
    }
    cout << endl;
    return 0;
}