#include <iostream>
#include <string>
using namespace std;
int n;
string s;
int main(){
    cin>>s;
    n=s.size();
    for(int i=0;i<n;i++){
        int x=s[i]-i-1;
        while(x<'A')x+=26;
        cout<<char(x);
    }
    cout<<endl;
    return 0;
}