import java.util.*;

class Main{
    public Main(){
        Scanner SC = new Scanner(System.in);

        String S = SC.next();

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

    }

    public static void main(String args[]){
        Main main = new Main();
    }
} import java.util.*; util.* java class Main{
    public Main(){
        Scanner SC = new Scanner(System.in);

        String S = SC.next();

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

    }

    public static void main(String args[]){
        Main main = new Main();
    }
} Main public Main(){
        Scanner SC = new Scanner(System.in);

        String S = SC.next();

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

    } Main {
        Scanner SC = new Scanner(System.in);

        String S = SC.next();

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

class Main{
    public Main(){
        Scanner SC = new Scanner(System.in);

        String S = SC.next();

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

    }

    public static void main(String args[]){
        Main main = new Main();
    }
}
