#include<iostream>
#include<cstdio>
#include<ctype.h>
using namespace std;

int main(void) {
	int n, key1, key2;
	cin >> n;

	key1 = n % 123;
	key2 = n % 91;
	if(islower(key1))
		putchar(key1);
	else if(isupper(key2))
		putchar(key2);
	else
		putchar('*');

	return 0;
}