#include<bits/stdc++.h>
using namespace std;
int main()
{
    char a;
	cin>>a;
	if(a=='Y')
	{
		cout<<"A";
	}
	else if(a=='Z')
	{
		cout<<"B";
	}
	else
    {
		char c=a+2;
		cout<<c;
	}
	return 0; 
}