#include <iostream>
#include <cstring>
#define S_LEN 1024
using namespace std;

int main()
{
	char S[S_LEN + 1];
	int size = 'Z' - 'A' + 1;
	cin >> S;

	int len = strlen(S);
	for (int i = 0; i < len; ++i)
	{
		S[i] = (S[i] - 'A' - ((i + 1) % size) + size) % size + 'A';
	}
	cout << S;

	return 0;
}