#include <iostream>
#include <algorithm>
#include <vector>
#include <string>
#include <cmath>
#include <iomanip>
#include <map>
using namespace std;
typedef long long LL;

int main(){
    string s;
    cin >> s;
    for(int i = 0; i < s.size(); i++){
        int c = s[i] - 'A';
        cout << (char)('A' + (c+26*10000-1-i)%26);
    }
    cout << endl;
    return 0;
}