import java.util.Scanner;
public class Main{
    public static void main(String[] args){
        Scanner scn = new Scanner(System.in);
        String s = scn.nextLine();
        String ans = "ABC";
        if(s.equals("ABC")){
            ans = "ARC";
        }
        System.out.println(ans);
    }
} import java.util.Scanner; Scanner java.util public class Main{
    public static void main(String[] args){
        Scanner scn = new Scanner(System.in);
        String s = scn.nextLine();
        String ans = "ABC";
        if(s.equals("ABC")){
            ans = "ARC";
        }
        System.out.println(ans);
    }
} Main public static void main(String[] args){
        Scanner scn = new Scanner(System.in);
        String s = scn.nextLine();
        String ans = "ABC";
        if(s.equals("ABC")){
            ans = "ARC";
        }
        System.out.println(ans);
    } main {
        Scanner scn = new Scanner(System.in);
        String s = scn.nextLine();
        String ans = "ABC";
        if(s.equals("ABC")){
            ans = "ARC";
        }
        System.out.println(ans);
    } Scanner scn = new Scanner(System.in); scn new Scanner(System.in) String s = scn.nextLine(); s scn.nextLine() scn.nextLine scn String ans = "ABC"; ans "ABC" if(s.equals("ABC")){
            ans = "ARC";
        } s.equals("ABC") s.equals s "ABC" {
            ans = "ARC";
        } ans = "ARC" ans "ARC" System.out.println(ans) System.out.println System.out System System.out ans String[] args args public class Main{
    public static void main(String[] args){
        Scanner scn = new Scanner(System.in);
        String s = scn.nextLine();
        String ans = "ABC";
        if(s.equals("ABC")){
            ans = "ARC";
        }
        System.out.println(ans);
    }
} public class Main{
    public static void main(String[] args){
        Scanner scn = new Scanner(System.in);
        String s = scn.nextLine();
        String ans = "ABC";
        if(s.equals("ABC")){
            ans = "ARC";
        }
        System.out.println(ans);
    }
} Main
import java.util.Scanner;
public class Main{
    public static void main(String[] args){
        Scanner scn = new Scanner(System.in);
        String s = scn.nextLine();
        String ans = "ABC";
        if(s.equals("ABC")){
            ans = "ARC";
        }
        System.out.println(ans);
    }
}