	import java.util.*;
	import java.util.Map.Entry;
	 
	 
	 class Main {
		 static int mod =  (int) (Math.pow(10,9)+7);
		 static List<ArrayList<Integer>>  list = new ArrayList<ArrayList<Integer>>();
	    public static void main(String[] args) {
	    	
	        Scanner sc = new Scanner(System.in);
	        String S = sc.next();	
	        if(S.equals("ABC")) {
	        	System.out.println("ARC");
	        } else {
	        	System.out.println("ABC");
	        }
	        
	        
	        long ans=0;
	        
	    }
	} import java.util.*; util.* java import java.util.Map.Entry; Entry java.util.Map class Main {
		 static int mod =  (int) (Math.pow(10,9)+7);
		 static List<ArrayList<Integer>>  list = new ArrayList<ArrayList<Integer>>();
	    public static void main(String[] args) {
	    	
	        Scanner sc = new Scanner(System.in);
	        String S = sc.next();	
	        if(S.equals("ABC")) {
	        	System.out.println("ARC");
	        } else {
	        	System.out.println("ABC");
	        }
	        
	        
	        long ans=0;
	        
	    }
	} Main static int mod =  (int) (Math.pow(10,9)+7); mod (int) (Math.pow(10,9)+7) Math.pow(10,9) Math.pow Math 10 9 7 static List<ArrayList<Integer>>  list = new ArrayList<ArrayList<Integer>>(); list new ArrayList<ArrayList<Integer>>() public static void main(String[] args) {
	    	
	        Scanner sc = new Scanner(System.in);
	        String S = sc.next();	
	        if(S.equals("ABC")) {
	        	System.out.println("ARC");
	        } else {
	        	System.out.println("ABC");
	        }
	        
	        
	        long ans=0;
	        
	    } main {
	    	
	        Scanner sc = new Scanner(System.in);
	        String S = sc.next();	
	        if(S.equals("ABC")) {
	        	System.out.println("ARC");
	        } else {
	        	System.out.println("ABC");
	        }
	        
	        
	        long ans=0;
	        
	    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) 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("ARC") System.out.println System.out System System.out "ARC" {
	        	System.out.println("ABC");
	        } System.out.println("ABC") System.out.println System.out System System.out "ABC" long ans=0; ans 0 String[] args args
	import java.util.*;
	import java.util.Map.Entry;
	 
	 
	 class Main {
		 static int mod =  (int) (Math.pow(10,9)+7);
		 static List<ArrayList<Integer>>  list = new ArrayList<ArrayList<Integer>>();
	    public static void main(String[] args) {
	    	
	        Scanner sc = new Scanner(System.in);
	        String S = sc.next();	
	        if(S.equals("ABC")) {
	        	System.out.println("ARC");
	        } else {
	        	System.out.println("ABC");
	        }
	        
	        
	        long ans=0;
	        
	    }
	}