import java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.regex.*;

public class Main {



    private static final Scanner sc = new Scanner(System.in);

    public static void main(String[] args) {
       String s = sc.next();
       if (s.equals("ABC") )
       System.out.println("ARC");
       else 
       System.out.println("ABC");

        //scanner.close();
    }
} import java.io.*; io.* java import java.math.*; math.* java import java.security.*; security.* java import java.text.*; text.* java import java.util.*; util.* java import java.util.concurrent.*; concurrent.* java.util import java.util.regex.*; regex.* java.util public class Main {



    private static final Scanner sc = new Scanner(System.in);

    public static void main(String[] args) {
       String s = sc.next();
       if (s.equals("ABC") )
       System.out.println("ARC");
       else 
       System.out.println("ABC");

        //scanner.close();
    }
} Main private static final Scanner sc = new Scanner(System.in); sc new Scanner(System.in) public static void main(String[] args) {
       String s = sc.next();
       if (s.equals("ABC") )
       System.out.println("ARC");
       else 
       System.out.println("ABC");

        //scanner.close();
    } main {
       String s = sc.next();
       if (s.equals("ABC") )
       System.out.println("ARC");
       else 
       System.out.println("ABC");

        //scanner.close();
    } String s = sc.next(); s sc.next() sc.next sc if (s.equals("ABC") )
       System.out.println("ARC");
       else 
       System.out.println("ABC"); s.equals("ABC") s.equals s "ABC" System.out.println("ARC") System.out.println System.out System System.out "ARC" System.out.println("ABC") System.out.println System.out System System.out "ABC" String[] args args public class Main {



    private static final Scanner sc = new Scanner(System.in);

    public static void main(String[] args) {
       String s = sc.next();
       if (s.equals("ABC") )
       System.out.println("ARC");
       else 
       System.out.println("ABC");

        //scanner.close();
    }
} public class Main {



    private static final Scanner sc = new Scanner(System.in);

    public static void main(String[] args) {
       String s = sc.next();
       if (s.equals("ABC") )
       System.out.println("ARC");
       else 
       System.out.println("ABC");

        //scanner.close();
    }
} Main
import java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.regex.*;

public class Main {



    private static final Scanner sc = new Scanner(System.in);

    public static void main(String[] args) {
       String s = sc.next();
       if (s.equals("ABC") )
       System.out.println("ARC");
       else 
       System.out.println("ABC");

        //scanner.close();
    }
}
