#include <iostream>
#include <vector>
#include <algorithm>
#include <math.h>

#define ALL(x) (x).begin(),(x).end()
#define REP(i,n) for(int i = 0;i < (n);i++)

using namespace std;

int main(){
    string s;
    cin >> s;
    REP(i,s.length()){
        s[i] -= (i+1)%26;
        s[i] += 'A' > s[i] ? 26 : 0;
    }
    cout << s << endl;
    return 0;
}