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


int main() {
string S;
string Ans;

cin >> S;

for(int i=0; i<S.size(); i++){
    if(S.at(i)-(i+1)%26>='A' && S.at(i)-(i+1)%26<='Z'){
    S.at(i)=S.at(i)-(i+1)%26;
    }
    else{
    S.at(i)=S.at(i)+(2625-i)%26;
}
}

cout << S;

}