import java.util.*;

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

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

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

        if(a.equals("ABC")){
            res = "ARC";
        } else {
            res = "ABC";
        }
        System.out.println(res);
    } main {
        Scanner sc = new Scanner(System.in);
        String a = sc.nextLine();
        String res = "" ;

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

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

        if(a.equals("ABC")){
            res = "ARC";
        } else {
            res = "ABC";
        }
        System.out.println(res);
    }
} Main
import java.util.*;

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

        if(a.equals("ABC")){
            res = "ARC";
        } else {
            res = "ABC";
        }
        System.out.println(res);
    }
}