#include <iostream>
using namespace std;

int main()
{
    char s[1025];
    cin >> s;

    for(int i = 0; s[i] != '\0'; i++){
        s[i] -= (i+1);
        while(s[i]<'A'){
            s[i] += 26;
        }    
    }

    cout << s << endl;

    return 0;
}