import java.util.*;
import java.io.*;

class Main {

	public static void main(String[] args) throws IOException{
		BufferedReader br =new BufferedReader(new InputStreamReader(System.in));
		String s=br.readLine();
		if(s.equals("ABC"))
		{
			System.out.println("ARC");
		}
		else
		{
			System.out.println("ABC");
		}

	}

} import java.util.*; util.* java import java.io.*; io.* java class Main {

	public static void main(String[] args) throws IOException{
		BufferedReader br =new BufferedReader(new InputStreamReader(System.in));
		String s=br.readLine();
		if(s.equals("ABC"))
		{
			System.out.println("ARC");
		}
		else
		{
			System.out.println("ABC");
		}

	}

} Main public static void main(String[] args) throws IOException{
		BufferedReader br =new BufferedReader(new InputStreamReader(System.in));
		String s=br.readLine();
		if(s.equals("ABC"))
		{
			System.out.println("ARC");
		}
		else
		{
			System.out.println("ABC");
		}

	} main {
		BufferedReader br =new BufferedReader(new InputStreamReader(System.in));
		String s=br.readLine();
		if(s.equals("ABC"))
		{
			System.out.println("ARC");
		}
		else
		{
			System.out.println("ABC");
		}

	} BufferedReader br =new BufferedReader(new InputStreamReader(System.in)); br new BufferedReader(new InputStreamReader(System.in)) String s=br.readLine(); s br.readLine() br.readLine br 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.io.*;

class Main {

	public static void main(String[] args) throws IOException{
		BufferedReader br =new BufferedReader(new InputStreamReader(System.in));
		String s=br.readLine();
		if(s.equals("ABC"))
		{
			System.out.println("ARC");
		}
		else
		{
			System.out.println("ABC");
		}

	}

}