import java.util.*;

public class Main {
	Scanner sc = new Scanner(System.in);
	final int MOD = 998244353;
	final int MAX = Integer.MAX_VALUE;
	final long LMAX = Long.MAX_VALUE;
	int len = (int)1e6 + 1;
	
	
	void doIt() {
		String S = sc.next();
		System.out.println((S.equals("ABC")?"ARC":"ABC"));
	}
	
	
	public static void main(String[] args) {
		new Main().doIt();
	}

} import java.util.*; util.* java public class Main {
	Scanner sc = new Scanner(System.in);
	final int MOD = 998244353;
	final int MAX = Integer.MAX_VALUE;
	final long LMAX = Long.MAX_VALUE;
	int len = (int)1e6 + 1;
	
	
	void doIt() {
		String S = sc.next();
		System.out.println((S.equals("ABC")?"ARC":"ABC"));
	}
	
	
	public static void main(String[] args) {
		new Main().doIt();
	}

} Main Scanner sc = new Scanner(System.in); sc new Scanner(System.in) final int MOD = 998244353; MOD 998244353 final int MAX = Integer.MAX_VALUE; MAX Integer.MAX_VALUE Integer Integer.MAX_VALUE final long LMAX = Long.MAX_VALUE; LMAX Long.MAX_VALUE Long Long.MAX_VALUE int len = (int)1e6 + 1; len (int)1e6 + 1 (int)1e6 1 void doIt() {
		String S = sc.next();
		System.out.println((S.equals("ABC")?"ARC":"ABC"));
	} doIt {
		String S = sc.next();
		System.out.println((S.equals("ABC")?"ARC":"ABC"));
	} String S = sc.next(); S sc.next() sc.next sc System.out.println((S.equals("ABC")?"ARC":"ABC")) System.out.println System.out System System.out (S.equals("ABC")?"ARC":"ABC") S.equals("ABC") S.equals S "ABC" "ARC" "ABC" public static void main(String[] args) {
		new Main().doIt();
	} main {
		new Main().doIt();
	} new Main().doIt() new Main().doIt new Main() String[] args args public class Main {
	Scanner sc = new Scanner(System.in);
	final int MOD = 998244353;
	final int MAX = Integer.MAX_VALUE;
	final long LMAX = Long.MAX_VALUE;
	int len = (int)1e6 + 1;
	
	
	void doIt() {
		String S = sc.next();
		System.out.println((S.equals("ABC")?"ARC":"ABC"));
	}
	
	
	public static void main(String[] args) {
		new Main().doIt();
	}

} public class Main {
	Scanner sc = new Scanner(System.in);
	final int MOD = 998244353;
	final int MAX = Integer.MAX_VALUE;
	final long LMAX = Long.MAX_VALUE;
	int len = (int)1e6 + 1;
	
	
	void doIt() {
		String S = sc.next();
		System.out.println((S.equals("ABC")?"ARC":"ABC"));
	}
	
	
	public static void main(String[] args) {
		new Main().doIt();
	}

} Main
import java.util.*;

public class Main {
	Scanner sc = new Scanner(System.in);
	final int MOD = 998244353;
	final int MAX = Integer.MAX_VALUE;
	final long LMAX = Long.MAX_VALUE;
	int len = (int)1e6 + 1;
	
	
	void doIt() {
		String S = sc.next();
		System.out.println((S.equals("ABC")?"ARC":"ABC"));
	}
	
	
	public static void main(String[] args) {
		new Main().doIt();
	}

}
