import java.util.*;
import java.io.*;
public class Main
{
    public static void main(String args[])throws Exception
    {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        PrintWriter pw=new PrintWriter(System.out);
        String s=br.readLine();
        if(s.equals("ABC"))
        pw.println("ARC");
        else
        pw.println("ABC");
        pw.flush();
        pw.close();
    }
} import java.util.*; util.* java import java.io.*; io.* java public class Main
{
    public static void main(String args[])throws Exception
    {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        PrintWriter pw=new PrintWriter(System.out);
        String s=br.readLine();
        if(s.equals("ABC"))
        pw.println("ARC");
        else
        pw.println("ABC");
        pw.flush();
        pw.close();
    }
} Main public static void main(String args[])throws Exception
    {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        PrintWriter pw=new PrintWriter(System.out);
        String s=br.readLine();
        if(s.equals("ABC"))
        pw.println("ARC");
        else
        pw.println("ABC");
        pw.flush();
        pw.close();
    } main {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        PrintWriter pw=new PrintWriter(System.out);
        String s=br.readLine();
        if(s.equals("ABC"))
        pw.println("ARC");
        else
        pw.println("ABC");
        pw.flush();
        pw.close();
    } BufferedReader br=new BufferedReader(new InputStreamReader(System.in)); br new BufferedReader(new InputStreamReader(System.in)) PrintWriter pw=new PrintWriter(System.out); pw new PrintWriter(System.out) String s=br.readLine(); s br.readLine() br.readLine br if(s.equals("ABC"))
        pw.println("ARC");
        else
        pw.println("ABC"); s.equals("ABC") s.equals s "ABC" pw.println("ARC") pw.println pw "ARC" pw.println("ABC") pw.println pw "ABC" pw.flush() pw.flush pw pw.close() pw.close pw String args[] args public class Main
{
    public static void main(String args[])throws Exception
    {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        PrintWriter pw=new PrintWriter(System.out);
        String s=br.readLine();
        if(s.equals("ABC"))
        pw.println("ARC");
        else
        pw.println("ABC");
        pw.flush();
        pw.close();
    }
} public class Main
{
    public static void main(String args[])throws Exception
    {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        PrintWriter pw=new PrintWriter(System.out);
        String s=br.readLine();
        if(s.equals("ABC"))
        pw.println("ARC");
        else
        pw.println("ABC");
        pw.flush();
        pw.close();
    }
} Main
import java.util.*;
import java.io.*;
public class Main
{
    public static void main(String args[])throws Exception
    {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        PrintWriter pw=new PrintWriter(System.out);
        String s=br.readLine();
        if(s.equals("ABC"))
        pw.println("ARC");
        else
        pw.println("ABC");
        pw.flush();
        pw.close();
    }
}