#include<cstdio>
#include <iostream>
#include<algorithm>
#include<string>
#include<queue>
#include<vector>
#include<functional>
#include<cmath>
#include<map>
#include<stack>
#include<set>
#include<numeric>

using namespace std;
typedef long long ll;
typedef pair<ll, ll> Pr;

string s,ans;

int main()
{
	cin >> s;
	int n = s.length();

	for (int i = 0; i < n; i++) {
		ans += (s[i] - 'Z' - (i + 1)) % 26 + 'Z';
	}
	cout << ans << endl;
	return 0;
}