#include <bits/stdc++.h>
using namespace std;

int main(){
	char a;
	cin>>a;
	if(a >= 'A' && a <= 'Y'|| a>='a' && a <= 'y'){
		a = a + 1;
	}else if(a == 'z'){
		a = 'a';
	}else if(a == 'Z'){
		a = 'A';
	}
	cout<<a;
}


/**************************************************************
	Problem: 1969
	User: admin
	Language: C++
	Result: Accepted
	Time:25 ms
	Memory:2072 kb
****************************************************************/