#include<iostream>
#include<string>
using namespace std;


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