#include<iostream>
#include<iomanip>
#include<cstdio>
#include<algorithm>
#include<math.h>
#include <string.h>
using namespace std;
int main(){
	int i,j,m,n,a,b;
	while(cin>>n){
		if(n<1200){
			cout<<"ABC"<<endl;
		}else{
			cout<<"ARC"<<endl; 
		}
	} 
	return 0;
}