#include <bits/stdc++.h>
using namespace std;


int main()
{
	string S;
	cin >> S;

	long long N = S.size();
	string ans;
	for( int i = 0; i < N; i++ ) {
		int n = S[i] - 'A';
		ans += (char)((n - (i + 1) + 26*N) % 26 + 'A');
	}

	cout << ans << endl;
}