#include <bits/stdc++.h>
using namespace std;
int main()
{
	string s;
	char c;
	while ((c = cin.get()) != '\n') s += c;
	int len = s.length();
	for (int i = 0; i < len; i ++)
	{
		if (s[i] >= 'A' && s[i] <= 'Z')
		{
			if (s[i] != 'A') cout << (char) (s[i] - 1);
			else cout << 'Z';
		}
		else if (s[i] >= 'a' && s[i] <= 'z')
		{
			if (s[i] != 'a') cout << (char) (s[i] - 1);
			else cout << 'z';
		}
		else cout << s[i];
	}
}

样例能过。