import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        
        Scanner sc = new Scanner(System.in);
        String line = sc.next();
        
        String result = "";
        
        if(line.equals("ABC"))
        {
            result = "ARC";
        }
        else
        {
            result = "ABC";
        }
        
        System.out.println(result);
    }
} import java.util.*; util.* java public class Main {
    public static void main(String[] args) throws Exception {
        
        Scanner sc = new Scanner(System.in);
        String line = sc.next();
        
        String result = "";
        
        if(line.equals("ABC"))
        {
            result = "ARC";
        }
        else
        {
            result = "ABC";
        }
        
        System.out.println(result);
    }
} Main public static void main(String[] args) throws Exception {
        
        Scanner sc = new Scanner(System.in);
        String line = sc.next();
        
        String result = "";
        
        if(line.equals("ABC"))
        {
            result = "ARC";
        }
        else
        {
            result = "ABC";
        }
        
        System.out.println(result);
    } main {
        
        Scanner sc = new Scanner(System.in);
        String line = sc.next();
        
        String result = "";
        
        if(line.equals("ABC"))
        {
            result = "ARC";
        }
        else
        {
            result = "ABC";
        }
        
        System.out.println(result);
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String line = sc.next(); line sc.next() sc.next sc String result = ""; result "" if(line.equals("ABC"))
        {
            result = "ARC";
        }
        else
        {
            result = "ABC";
        } line.equals("ABC") line.equals line "ABC" {
            result = "ARC";
        } result = "ARC" result "ARC" {
            result = "ABC";
        } result = "ABC" result "ABC" System.out.println(result) System.out.println System.out System System.out result String[] args args public class Main {
    public static void main(String[] args) throws Exception {
        
        Scanner sc = new Scanner(System.in);
        String line = sc.next();
        
        String result = "";
        
        if(line.equals("ABC"))
        {
            result = "ARC";
        }
        else
        {
            result = "ABC";
        }
        
        System.out.println(result);
    }
} public class Main {
    public static void main(String[] args) throws Exception {
        
        Scanner sc = new Scanner(System.in);
        String line = sc.next();
        
        String result = "";
        
        if(line.equals("ABC"))
        {
            result = "ARC";
        }
        else
        {
            result = "ABC";
        }
        
        System.out.println(result);
    }
} Main
import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        
        Scanner sc = new Scanner(System.in);
        String line = sc.next();
        
        String result = "";
        
        if(line.equals("ABC"))
        {
            result = "ARC";
        }
        else
        {
            result = "ABC";
        }
        
        System.out.println(result);
    }
}
