#include<bits/stdc++.h>
using namespace std;
int main(){
    string s;
    cin >> s;
    for(int i=1; i<=s.size(); i++){
        if(s[i-1]-'A'>=i) s[i-1]-=i%26;
        else s[i-1]+=26-i%26;
    }
    cout << s << endl;
}