#include <iostream>

using namespace std;

int main(int argc, const char* argv[])
{
	string S;
	cin >> S;
	int i = 0;
	for (auto&& c : S) {
		i++;
		cout << (char)((c - 'A' + (26 - i % 26)) % 26 + 'A');
	}
	cout << endl;
	return 0;
}