#include<iostream>
#include<string>
#include<algorithm>
#include<vector>
#include<queue>
#include<stack>
#include<cmath>
#include<cstdlib>
#include<ctime>
using namespace std;
typedef long long ll;
int main() {
	string s;
	cin >> s;
	for (int i = 0; i < s.size(); i++) {
		if (65 <= s[i] - (i + 1) % 26)s[i] = s[i] - (i + 1) % 26;
		else s[i] = s[i] - (i + 1) % 26 + 26;
	}
	cout << s << endl;
	return 0;
}