import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        // Your code here!
        Scanner scan = new Scanner(System.in);
        String s=scan.next();
        if(s.charAt(1)=='B'){
            System.out.println("ARC");
        }
        else{
            System.out.println("ABC");
        }
    }
} import java.util.*; util.* java public class Main {
    public static void main(String[] args) throws Exception {
        // Your code here!
        Scanner scan = new Scanner(System.in);
        String s=scan.next();
        if(s.charAt(1)=='B'){
            System.out.println("ARC");
        }
        else{
            System.out.println("ABC");
        }
    }
} Main public static void main(String[] args) throws Exception {
        // Your code here!
        Scanner scan = new Scanner(System.in);
        String s=scan.next();
        if(s.charAt(1)=='B'){
            System.out.println("ARC");
        }
        else{
            System.out.println("ABC");
        }
    } main {
        // Your code here!
        Scanner scan = new Scanner(System.in);
        String s=scan.next();
        if(s.charAt(1)=='B'){
            System.out.println("ARC");
        }
        else{
            System.out.println("ABC");
        }
    } Scanner scan = new Scanner(System.in); scan new Scanner(System.in) String s=scan.next(); s scan.next() scan.next scan if(s.charAt(1)=='B'){
            System.out.println("ARC");
        }
        else{
            System.out.println("ABC");
        } s.charAt(1)=='B' s.charAt(1) s.charAt s 1 'B' {
            System.out.println("ARC");
        } System.out.println("ARC") System.out.println System.out System System.out "ARC" {
            System.out.println("ABC");
        } 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) throws Exception {
        // Your code here!
        Scanner scan = new Scanner(System.in);
        String s=scan.next();
        if(s.charAt(1)=='B'){
            System.out.println("ARC");
        }
        else{
            System.out.println("ABC");
        }
    }
} public class Main {
    public static void main(String[] args) throws Exception {
        // Your code here!
        Scanner scan = new Scanner(System.in);
        String s=scan.next();
        if(s.charAt(1)=='B'){
            System.out.println("ARC");
        }
        else{
            System.out.println("ABC");
        }
    }
} Main
import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        // Your code here!
        Scanner scan = new Scanner(System.in);
        String s=scan.next();
        if(s.charAt(1)=='B'){
            System.out.println("ARC");
        }
        else{
            System.out.println("ABC");
        }
    }
}
