#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <algorithm>
typedef long long ll;
#define rep(i, a, b) for (int i = a; i <= b; ++ i)
using namespace std;
int n;
int main() {
	scanf("%d", &n);
	if (n < 1200) printf("ABC");
		else printf("ARC");
	return 0;
}