import java.util.*;
import java.lang.*;
public class Main
{
    public static void main (String[] args)
    {
        Scanner sc = new Scanner(System.in);
        String s=sc.nextLine();
        if(s.charAt(1)=='R')
            System.out.println("ABC");
        else
            System.out.println("ARC");
    }
} import java.util.*; util.* java import java.lang.*; lang.* java public class Main
{
    public static void main (String[] args)
    {
        Scanner sc = new Scanner(System.in);
        String s=sc.nextLine();
        if(s.charAt(1)=='R')
            System.out.println("ABC");
        else
            System.out.println("ARC");
    }
} Main public static void main (String[] args)
    {
        Scanner sc = new Scanner(System.in);
        String s=sc.nextLine();
        if(s.charAt(1)=='R')
            System.out.println("ABC");
        else
            System.out.println("ARC");
    } main {
        Scanner sc = new Scanner(System.in);
        String s=sc.nextLine();
        if(s.charAt(1)=='R')
            System.out.println("ABC");
        else
            System.out.println("ARC");
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String s=sc.nextLine(); s sc.nextLine() sc.nextLine sc if(s.charAt(1)=='R')
            System.out.println("ABC");
        else
            System.out.println("ARC"); s.charAt(1)=='R' s.charAt(1) s.charAt s 1 'R' System.out.println("ABC") System.out.println System.out System System.out "ABC" System.out.println("ARC") System.out.println System.out System System.out "ARC" String[] args args public class Main
{
    public static void main (String[] args)
    {
        Scanner sc = new Scanner(System.in);
        String s=sc.nextLine();
        if(s.charAt(1)=='R')
            System.out.println("ABC");
        else
            System.out.println("ARC");
    }
} public class Main
{
    public static void main (String[] args)
    {
        Scanner sc = new Scanner(System.in);
        String s=sc.nextLine();
        if(s.charAt(1)=='R')
            System.out.println("ABC");
        else
            System.out.println("ARC");
    }
} Main
import java.util.*;
import java.lang.*;
public class Main
{
    public static void main (String[] args)
    {
        Scanner sc = new Scanner(System.in);
        String s=sc.nextLine();
        if(s.charAt(1)=='R')
            System.out.println("ABC");
        else
            System.out.println("ARC");
    }
}