#include <iostream>
#include <string>

int main()
{
	std::string S;
	std::cin >> S;
	for (int i = 0,n = (signed)S.size(); i < n; i++)
	{
		for (int j = 0; j <= i; j++)
		{
			if (S[i] == 'A')
			{
				S[i] = 'Z';
			}
			else
			{
				S[i]--;
			}
		}
	}
	std::cout << S << std::endl;
	return 0;
}