#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < n; i++)
using namespace std;

string str;

int main(){
	cin >> str;
	int s = str.size();
	rep(i,s){
		int j = i+1;
		j %= 26;
		if(str[i]-j < 'A') j -= 26;
		str[i] -= j;
	}
	cout << str << endl;
}