import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        // input
        Scanner sc = new Scanner(System.in);
        String s = sc.next();

        String ans = "";
        if (s.equals("ABC")) ans = "ARC";
        else ans = "ABC";
        System.out.println(ans);
    }
} import java.util.Scanner; Scanner java.util public class Main {

    public static void main(String[] args) {
        // input
        Scanner sc = new Scanner(System.in);
        String s = sc.next();

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

        String ans = "";
        if (s.equals("ABC")) ans = "ARC";
        else ans = "ABC";
        System.out.println(ans);
    } main {
        // input
        Scanner sc = new Scanner(System.in);
        String s = sc.next();

        String ans = "";
        if (s.equals("ABC")) ans = "ARC";
        else ans = "ABC";
        System.out.println(ans);
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String s = sc.next(); s sc.next() sc.next sc String ans = ""; ans "" if (s.equals("ABC")) ans = "ARC";
        else ans = "ABC"; s.equals("ABC") s.equals s "ABC" ans = "ARC" ans "ARC" ans = "ABC" ans "ABC" 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) {
        // input
        Scanner sc = new Scanner(System.in);
        String s = sc.next();

        String ans = "";
        if (s.equals("ABC")) ans = "ARC";
        else ans = "ABC";
        System.out.println(ans);
    }
} public class Main {

    public static void main(String[] args) {
        // input
        Scanner sc = new Scanner(System.in);
        String s = sc.next();

        String ans = "";
        if (s.equals("ABC")) ans = "ARC";
        else ans = "ABC";
        System.out.println(ans);
    }
} Main
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        // input
        Scanner sc = new Scanner(System.in);
        String s = sc.next();

        String ans = "";
        if (s.equals("ABC")) ans = "ARC";
        else ans = "ABC";
        System.out.println(ans);
    }
}
