import java.io.*;
import java.util.*;

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

class Main
{
    public static void main(String args[])throws Exception
    {
        BufferedReader bu=new BufferedReader(new InputStreamReader(System.in));
        String s=bu.readLine();
        String ans="";
        if(s.equals("ABC")) ans="ARC";
        else ans="ABC";
        System.out.print(ans);
    }
}
