#include<iostream>
#include<stdio.h>
#include<string.h>
#include<math.h>
#include<algorithm>
#define ll long long
#include<set>
#include<map>
#include<sstream>
using namespace std;
int main()
{
ll x;
scanf("%lld",&x);
printf("%c\n",(x%9-1+'A'));
// printf("G\n");
return 0;
}