#include<bits/stdc++.h>
using namespace std;
using LL = long long;
using ULL = unsigned long long;
#define rep(i,n) for(int i=0; i<(n); i++)

int main() {
    string alp = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    string S; cin >> S;
    rep(i, S.size())
        S[i] = alp[(alp.find(S[i]) + 25 - i % 26) % 26];
    cout << S << endl;
    return 0;
}