import java.io.*;

public class Main {
  
  public static void main(String[] args) throws Exception {
    
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

    String[] in = br.readLine().split(" ");

    br.close();
    
    PrintWriter out = new PrintWriter(System.out);
    out.println(in[0].equals("ABC") ? "ARC" : "ABC");
    out.flush();

  }
} import java.io.*; io.* java public class Main {
  
  public static void main(String[] args) throws Exception {
    
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

    String[] in = br.readLine().split(" ");

    br.close();
    
    PrintWriter out = new PrintWriter(System.out);
    out.println(in[0].equals("ABC") ? "ARC" : "ABC");
    out.flush();

  }
} Main public static void main(String[] args) throws Exception {
    
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

    String[] in = br.readLine().split(" ");

    br.close();
    
    PrintWriter out = new PrintWriter(System.out);
    out.println(in[0].equals("ABC") ? "ARC" : "ABC");
    out.flush();

  } main {
    
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

    String[] in = br.readLine().split(" ");

    br.close();
    
    PrintWriter out = new PrintWriter(System.out);
    out.println(in[0].equals("ABC") ? "ARC" : "ABC");
    out.flush();

  } BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); br new BufferedReader(new InputStreamReader(System.in)) String[] in = br.readLine().split(" "); in br.readLine().split(" ") br.readLine().split br.readLine() br.readLine br " " br.close() br.close br PrintWriter out = new PrintWriter(System.out); out new PrintWriter(System.out) out.println(in[0].equals("ABC") ? "ARC" : "ABC") out.println out in[0].equals("ABC") ? "ARC" : "ABC" in[0].equals("ABC") in[0].equals in[0] in 0 "ABC" "ARC" "ABC" out.flush() out.flush out String[] args args public class Main {
  
  public static void main(String[] args) throws Exception {
    
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

    String[] in = br.readLine().split(" ");

    br.close();
    
    PrintWriter out = new PrintWriter(System.out);
    out.println(in[0].equals("ABC") ? "ARC" : "ABC");
    out.flush();

  }
} public class Main {
  
  public static void main(String[] args) throws Exception {
    
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

    String[] in = br.readLine().split(" ");

    br.close();
    
    PrintWriter out = new PrintWriter(System.out);
    out.println(in[0].equals("ABC") ? "ARC" : "ABC");
    out.flush();

  }
} Main
import java.io.*;

public class Main {
  
  public static void main(String[] args) throws Exception {
    
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

    String[] in = br.readLine().split(" ");

    br.close();
    
    PrintWriter out = new PrintWriter(System.out);
    out.println(in[0].equals("ABC") ? "ARC" : "ABC");
    out.flush();

  }
}