import java.util.*;
 
public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		String b = "ABC";
		String r = "ARC";

		if(S.equals(b))
		System.out.println("ARC");
		else if(S.equals(r))
		System.out.println("ABC");
		
	}
} import java.util.*; util.* java public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		String b = "ABC";
		String r = "ARC";

		if(S.equals(b))
		System.out.println("ARC");
		else if(S.equals(r))
		System.out.println("ABC");
		
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		String b = "ABC";
		String r = "ARC";

		if(S.equals(b))
		System.out.println("ARC");
		else if(S.equals(r))
		System.out.println("ABC");
		
	} main {
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		String b = "ABC";
		String r = "ARC";

		if(S.equals(b))
		System.out.println("ARC");
		else if(S.equals(r))
		System.out.println("ABC");
		
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String S = sc.next(); S sc.next() sc.next sc String b = "ABC"; b "ABC" String r = "ARC"; r "ARC" if(S.equals(b))
		System.out.println("ARC");
		else if(S.equals(r))
		System.out.println("ABC"); S.equals(b) S.equals S b System.out.println("ARC") System.out.println System.out System System.out "ARC" if(S.equals(r))
		System.out.println("ABC"); S.equals(r) S.equals S r System.out.println("ABC") System.out.println System.out System System.out "ABC" String[] args args public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		String b = "ABC";
		String r = "ARC";

		if(S.equals(b))
		System.out.println("ARC");
		else if(S.equals(r))
		System.out.println("ABC");
		
	}
} public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		String b = "ABC";
		String r = "ARC";

		if(S.equals(b))
		System.out.println("ARC");
		else if(S.equals(r))
		System.out.println("ABC");
		
	}
} Main
import java.util.*;
 
public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		String b = "ABC";
		String r = "ARC";

		if(S.equals(b))
		System.out.println("ARC");
		else if(S.equals(r))
		System.out.println("ABC");
		
	}
}