#include <iostream>
using namespace std;

int main(void){
	string s;
	cin >> s;
	for(int i = 0;i < s.size();i++){
		s[i] += (s[i] - 'A' < i % 26 + 1 ? 25 : -1)  - i % 26; 
	}
	cout << s << endl;
}