import java.util.*;

public class Main {
    public static void main(String args[]) {
        Scanner scn = new Scanner(System.in);
        String s = scn.nextLine();
        String ans = "ARC";

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

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

        if (s.equals(ans)) {
            System.out.println("ABC");
        } else {
            System.out.println(ans);
        }
        scn.close();
    } main {
        Scanner scn = new Scanner(System.in);
        String s = scn.nextLine();
        String ans = "ARC";

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

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

        if (s.equals(ans)) {
            System.out.println("ABC");
        } else {
            System.out.println(ans);
        }
        scn.close();
    }
} Main
import java.util.*;

public class Main {
    public static void main(String args[]) {
        Scanner scn = new Scanner(System.in);
        String s = scn.nextLine();
        String ans = "ARC";

        if (s.equals(ans)) {
            System.out.println("ABC");
        } else {
            System.out.println(ans);
        }
        scn.close();
    }
}