#include <iostream>
#include <string>

using namespace std;

string S;

int main() {
	cin >> S;
	string res;
	for (int i = 0; i < S.length(); i++) {
		int a = S[i] - 'A';
		int b = (a + 2600 - (i + 1)) % 26;
		char c = 'A' + b;
		res += c;
	}
	cout << res << endl;
	return 0;
}