#include<cstdio>  
#include<iostream>  
#include<algorithm>  
#include<cstdlib>  
#include<cstring>
#include<string>
#include<climits>
#include<vector>
#include<cmath>
#define LL long long

using namespace std;

int n,m;

int main()
{
	cin>>n;
	if (n<1200) puts("ABC");
	else puts("ARC");
	return 0;
}