#include "iostream"
using namespace std;

char letter[1200];
int ans[1200];

int main() {
	cin >> letter;
	for (int i = 0; letter[i] != NULL; i++) {
		ans[i] = letter[i] - 'A';
		ans[i] += 26 - (i + 1) % 26;
		ans[i] %= 26;
		letter[i] = ans[i] + 'A';
	}
	cout << letter << "\n";
}