/*package whatever //do not write package name here */
import java.util.*;
import java.io.*;

class Main {
	public static void main (String[] args) {
// 		System.out.println("GfG!");
		Scanner input=new Scanner(System.in);
		String S=input.nextLine();
		if(S.equals("ABC"))
		    System.out.println("ARC");
		else
		    System.out.println("ABC");
		input.close();
		
	}
} import java.util.*; util.* java import java.io.*; io.* java class Main {
	public static void main (String[] args) {
// 		System.out.println("GfG!");
		Scanner input=new Scanner(System.in);
		String S=input.nextLine();
		if(S.equals("ABC"))
		    System.out.println("ARC");
		else
		    System.out.println("ABC");
		input.close();
		
	}
} Main public static void main (String[] args) {
// 		System.out.println("GfG!");
		Scanner input=new Scanner(System.in);
		String S=input.nextLine();
		if(S.equals("ABC"))
		    System.out.println("ARC");
		else
		    System.out.println("ABC");
		input.close();
		
	} main {
// 		System.out.println("GfG!");
		Scanner input=new Scanner(System.in);
		String S=input.nextLine();
		if(S.equals("ABC"))
		    System.out.println("ARC");
		else
		    System.out.println("ABC");
		input.close();
		
	} Scanner input=new Scanner(System.in); input new Scanner(System.in) String S=input.nextLine(); S input.nextLine() input.nextLine input 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 System.out System System.out "ARC" System.out.println("ABC") System.out.println System.out System System.out "ABC" input.close() input.close input String[] args args
/*package whatever //do not write package name here */
import java.util.*;
import java.io.*;

class Main {
	public static void main (String[] args) {
// 		System.out.println("GfG!");
		Scanner input=new Scanner(System.in);
		String S=input.nextLine();
		if(S.equals("ABC"))
		    System.out.println("ARC");
		else
		    System.out.println("ABC");
		input.close();
		
	}
}