#include <iostream>
#include <algorithm>
#include <vector>
#include<string>

using namespace std;
int main() {
	string s;
	cin >> s;
	int size = s.size();
	for (int i = 0; i < size; i++) {
		s[i] -= (i+1)%26;
		if(s[i] < 'A') {
			s[i] = '[' - ('A' - s[i]);
		}
	}
	cout << s << endl;
	return 0;
}