import java.util.*;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Map;
import java.util.TreeMap;
import java.util.HashMap;

class Main{
    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");
        }
    }
} import java.util.*; util.* java import java.util.ArrayList; ArrayList java.util import java.util.Collections; Collections java.util import java.util.Map; Map java.util import java.util.TreeMap; TreeMap java.util import java.util.HashMap; HashMap java.util class Main{
    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");
        }
    }
} Main 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");
        }
    } main {
        
        Scanner sc = new Scanner(System.in);
 
        String s = sc.next();

        if(s.equals("ABC")){
            System.out.println("ARC");
        }
        else{
            System.out.println("ABC");
        }
    } 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" String[] args args
import java.util.*;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Map;
import java.util.TreeMap;
import java.util.HashMap;

class Main{
    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");
        }
    }
}