import java.util.*;

class Main {

    static int gcd(int a, int b) {
        return b > 0 ? gcd(b, a % b) : a;
    }

    static int lcm(int a, int b) {
        return a * b / gcd(a, b);
    }

    public static void main(String[] args) {

        long res = 0;
        Scanner sc = new Scanner(System.in);
        // int n = sc.nextInt();
        String str = sc.next();
        char[] ch = str.toCharArray();

        if (ch[0] == 'A' && ch[1] == 'R' && ch[2] == 'C') {
            System.out.println("ABC");
        } else {
            System.out.println("ARC");
        }

        // System.out.println(res);
        sc.close();
    }
} import java.util.*; util.* java class Main {

    static int gcd(int a, int b) {
        return b > 0 ? gcd(b, a % b) : a;
    }

    static int lcm(int a, int b) {
        return a * b / gcd(a, b);
    }

    public static void main(String[] args) {

        long res = 0;
        Scanner sc = new Scanner(System.in);
        // int n = sc.nextInt();
        String str = sc.next();
        char[] ch = str.toCharArray();

        if (ch[0] == 'A' && ch[1] == 'R' && ch[2] == 'C') {
            System.out.println("ABC");
        } else {
            System.out.println("ARC");
        }

        // System.out.println(res);
        sc.close();
    }
} Main static int gcd(int a, int b) {
        return b > 0 ? gcd(b, a % b) : a;
    } gcd {
        return b > 0 ? gcd(b, a % b) : a;
    } return b > 0 ? gcd(b, a % b) : a; b > 0 ? gcd(b, a % b) : a b > 0 b 0 gcd(b, a % b) gcd b a % b a b a int a a int b b static int lcm(int a, int b) {
        return a * b / gcd(a, b);
    } lcm {
        return a * b / gcd(a, b);
    } return a * b / gcd(a, b); a * b / gcd(a, b) a * b a b gcd(a, b) gcd a b int a a int b b public static void main(String[] args) {

        long res = 0;
        Scanner sc = new Scanner(System.in);
        // int n = sc.nextInt();
        String str = sc.next();
        char[] ch = str.toCharArray();

        if (ch[0] == 'A' && ch[1] == 'R' && ch[2] == 'C') {
            System.out.println("ABC");
        } else {
            System.out.println("ARC");
        }

        // System.out.println(res);
        sc.close();
    } main {

        long res = 0;
        Scanner sc = new Scanner(System.in);
        // int n = sc.nextInt();
        String str = sc.next();
        char[] ch = str.toCharArray();

        if (ch[0] == 'A' && ch[1] == 'R' && ch[2] == 'C') {
            System.out.println("ABC");
        } else {
            System.out.println("ARC");
        }

        // System.out.println(res);
        sc.close();
    } long res = 0; res 0 Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String str = sc.next(); str sc.next() sc.next sc char[] ch = str.toCharArray(); ch str.toCharArray() str.toCharArray str if (ch[0] == 'A' && ch[1] == 'R' && ch[2] == 'C') {
            System.out.println("ABC");
        } else {
            System.out.println("ARC");
        } ch[0] == 'A' && ch[1] == 'R' && ch[2] == 'C' ch[0] == 'A' && ch[1] == 'R' && ch[2] == 'C' ch[0] == 'A' ch[0] ch 0 'A' ch[1] == 'R' ch[1] ch 1 'R' ch[2] == 'C' ch[2] ch 2 'C' {
            System.out.println("ABC");
        } System.out.println("ABC") System.out.println System.out System System.out "ABC" {
            System.out.println("ARC");
        } System.out.println("ARC") System.out.println System.out System System.out "ARC" sc.close() sc.close sc String[] args args
import java.util.*;

class Main {

    static int gcd(int a, int b) {
        return b > 0 ? gcd(b, a % b) : a;
    }

    static int lcm(int a, int b) {
        return a * b / gcd(a, b);
    }

    public static void main(String[] args) {

        long res = 0;
        Scanner sc = new Scanner(System.in);
        // int n = sc.nextInt();
        String str = sc.next();
        char[] ch = str.toCharArray();

        if (ch[0] == 'A' && ch[1] == 'R' && ch[2] == 'C') {
            System.out.println("ABC");
        } else {
            System.out.println("ARC");
        }

        // System.out.println(res);
        sc.close();
    }
}
