import java.io.*;
import java.math.*;
import java.util.*;
public class Main {

	public static void main(String[] args) {
		long mod = (long)(1e9+7);
		Scanner input = new Scanner(System.in);
		String x = input.next();
		System.out.println(x.equals("ABC")?"ARC":"ABC");
	}
} import java.io.*; io.* java import java.math.*; math.* java import java.util.*; util.* java public class Main {

	public static void main(String[] args) {
		long mod = (long)(1e9+7);
		Scanner input = new Scanner(System.in);
		String x = input.next();
		System.out.println(x.equals("ABC")?"ARC":"ABC");
	}
} Main public static void main(String[] args) {
		long mod = (long)(1e9+7);
		Scanner input = new Scanner(System.in);
		String x = input.next();
		System.out.println(x.equals("ABC")?"ARC":"ABC");
	} main {
		long mod = (long)(1e9+7);
		Scanner input = new Scanner(System.in);
		String x = input.next();
		System.out.println(x.equals("ABC")?"ARC":"ABC");
	} long mod = (long)(1e9+7); mod (long)(1e9+7) 1e9 7 Scanner input = new Scanner(System.in); input new Scanner(System.in) String x = input.next(); x input.next() input.next input System.out.println(x.equals("ABC")?"ARC":"ABC") System.out.println System.out System System.out x.equals("ABC")?"ARC":"ABC" x.equals("ABC") x.equals x "ABC" "ARC" "ABC" String[] args args public class Main {

	public static void main(String[] args) {
		long mod = (long)(1e9+7);
		Scanner input = new Scanner(System.in);
		String x = input.next();
		System.out.println(x.equals("ABC")?"ARC":"ABC");
	}
} public class Main {

	public static void main(String[] args) {
		long mod = (long)(1e9+7);
		Scanner input = new Scanner(System.in);
		String x = input.next();
		System.out.println(x.equals("ABC")?"ARC":"ABC");
	}
} Main
import java.io.*;
import java.math.*;
import java.util.*;
public class Main {

	public static void main(String[] args) {
		long mod = (long)(1e9+7);
		Scanner input = new Scanner(System.in);
		String x = input.next();
		System.out.println(x.equals("ABC")?"ARC":"ABC");
	}
}