import java.util.*;
import javax.lang.model.util.ElementScanner6;
//import java.lang.Math;

public class Main {

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

        // 入力
        //long x = sc.nextLong();
        String s = sc.next();

        // 処理
        String out = "ABC";
        if(s.equals("ABC")){
            out = "ARC";
        }

        // 出力
        System.out.println(out);
    }
} import java.util.*; util.* java import javax.lang.model.util.ElementScanner6; ElementScanner6 javax.lang.model.util public class Main {

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

        // 入力
        //long x = sc.nextLong();
        String s = sc.next();

        // 処理
        String out = "ABC";
        if(s.equals("ABC")){
            out = "ARC";
        }

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

        // 入力
        //long x = sc.nextLong();
        String s = sc.next();

        // 処理
        String out = "ABC";
        if(s.equals("ABC")){
            out = "ARC";
        }

        // 出力
        System.out.println(out);
    } main {
        Scanner sc = new Scanner(System.in);

        // 入力
        //long x = sc.nextLong();
        String s = sc.next();

        // 処理
        String out = "ABC";
        if(s.equals("ABC")){
            out = "ARC";
        }

        // 出力
        System.out.println(out);
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String s = sc.next(); s sc.next() sc.next sc String out = "ABC"; out "ABC" if(s.equals("ABC")){
            out = "ARC";
        } s.equals("ABC") s.equals s "ABC" {
            out = "ARC";
        } out = "ARC" out "ARC" System.out.println(out) System.out.println System.out System System.out out String[] args args public class Main {

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

        // 入力
        //long x = sc.nextLong();
        String s = sc.next();

        // 処理
        String out = "ABC";
        if(s.equals("ABC")){
            out = "ARC";
        }

        // 出力
        System.out.println(out);
    }
} public class Main {

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

        // 入力
        //long x = sc.nextLong();
        String s = sc.next();

        // 処理
        String out = "ABC";
        if(s.equals("ABC")){
            out = "ARC";
        }

        // 出力
        System.out.println(out);
    }
} Main
import java.util.*;
import javax.lang.model.util.ElementScanner6;
//import java.lang.Math;

public class Main {

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

        // 入力
        //long x = sc.nextLong();
        String s = sc.next();

        // 処理
        String out = "ABC";
        if(s.equals("ABC")){
            out = "ARC";
        }

        // 出力
        System.out.println(out);
    }
}