import java.util.Scanner;

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

        String S = sc.next();

        if (S.charAt(1) == 'B') {
            System.out.println("ARC");
        } else if (S.charAt(1) == 'R') {
            System.out.println("ABC");
        } else {

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

        String S = sc.next();

        if (S.charAt(1) == 'B') {
            System.out.println("ARC");
        } else if (S.charAt(1) == 'R') {
            System.out.println("ABC");
        } else {

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

        String S = sc.next();

        if (S.charAt(1) == 'B') {
            System.out.println("ARC");
        } else if (S.charAt(1) == 'R') {
            System.out.println("ABC");
        } else {

        }
    } main {
        Scanner sc = new Scanner(System.in);

        String S = sc.next();

        if (S.charAt(1) == 'B') {
            System.out.println("ARC");
        } else if (S.charAt(1) == 'R') {
            System.out.println("ABC");
        } else {

        }
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String S = sc.next(); S sc.next() sc.next sc if (S.charAt(1) == 'B') {
            System.out.println("ARC");
        } else if (S.charAt(1) == 'R') {
            System.out.println("ABC");
        } else {

        } 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" if (S.charAt(1) == 'R') {
            System.out.println("ABC");
        } else {

        } S.charAt(1) == 'R' S.charAt(1) S.charAt S 1 'R' {
            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) {
        Scanner sc = new Scanner(System.in);

        String S = sc.next();

        if (S.charAt(1) == 'B') {
            System.out.println("ARC");
        } else if (S.charAt(1) == 'R') {
            System.out.println("ABC");
        } else {

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

        String S = sc.next();

        if (S.charAt(1) == 'B') {
            System.out.println("ARC");
        } else if (S.charAt(1) == 'R') {
            System.out.println("ABC");
        } else {

        }
    }
} Main
import java.util.Scanner;

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

        String S = sc.next();

        if (S.charAt(1) == 'B') {
            System.out.println("ARC");
        } else if (S.charAt(1) == 'R') {
            System.out.println("ABC");
        } else {

        }
    }
}