#include<bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int,int> pii;

long long MOD = 1000000000 + 7;

int main(){
  cout << setprecision(10);
  string S;
  cin >> S;
  string ans;
  if(S == "ABC"){
    ans = "ARC";
  } else {
    ans = "ARC";
  }
  cout << ans << endl;
}
