//make sure to make new file!
import java.io.*;
import java.util.*;

public class Main{
   
   public static void main(String[] args)throws IOException{
      BufferedReader f = new BufferedReader(new InputStreamReader(System.in));
      PrintWriter out = new PrintWriter(System.out);
      
      String s = f.readLine();
      
      if(s.equals("ABC")){
         out.println("ARC");
      } else {
         out.println("ABC");
      }
      
      
      
      
      
      
      
      
      
      out.close();
   }
   
      
} import java.io.*; io.* java import java.util.*; util.* java public class Main{
   
   public static void main(String[] args)throws IOException{
      BufferedReader f = new BufferedReader(new InputStreamReader(System.in));
      PrintWriter out = new PrintWriter(System.out);
      
      String s = f.readLine();
      
      if(s.equals("ABC")){
         out.println("ARC");
      } else {
         out.println("ABC");
      }
      
      
      
      
      
      
      
      
      
      out.close();
   }
   
      
} Main public static void main(String[] args)throws IOException{
      BufferedReader f = new BufferedReader(new InputStreamReader(System.in));
      PrintWriter out = new PrintWriter(System.out);
      
      String s = f.readLine();
      
      if(s.equals("ABC")){
         out.println("ARC");
      } else {
         out.println("ABC");
      }
      
      
      
      
      
      
      
      
      
      out.close();
   } main {
      BufferedReader f = new BufferedReader(new InputStreamReader(System.in));
      PrintWriter out = new PrintWriter(System.out);
      
      String s = f.readLine();
      
      if(s.equals("ABC")){
         out.println("ARC");
      } else {
         out.println("ABC");
      }
      
      
      
      
      
      
      
      
      
      out.close();
   } BufferedReader f = new BufferedReader(new InputStreamReader(System.in)); f new BufferedReader(new InputStreamReader(System.in)) PrintWriter out = new PrintWriter(System.out); out new PrintWriter(System.out) String s = f.readLine(); s f.readLine() f.readLine f if(s.equals("ABC")){
         out.println("ARC");
      } else {
         out.println("ABC");
      } s.equals("ABC") s.equals s "ABC" {
         out.println("ARC");
      } out.println("ARC") out.println out "ARC" {
         out.println("ABC");
      } out.println("ABC") out.println out "ABC" out.close() out.close out String[] args args public class Main{
   
   public static void main(String[] args)throws IOException{
      BufferedReader f = new BufferedReader(new InputStreamReader(System.in));
      PrintWriter out = new PrintWriter(System.out);
      
      String s = f.readLine();
      
      if(s.equals("ABC")){
         out.println("ARC");
      } else {
         out.println("ABC");
      }
      
      
      
      
      
      
      
      
      
      out.close();
   }
   
      
} public class Main{
   
   public static void main(String[] args)throws IOException{
      BufferedReader f = new BufferedReader(new InputStreamReader(System.in));
      PrintWriter out = new PrintWriter(System.out);
      
      String s = f.readLine();
      
      if(s.equals("ABC")){
         out.println("ARC");
      } else {
         out.println("ABC");
      }
      
      
      
      
      
      
      
      
      
      out.close();
   }
   
      
} Main
//make sure to make new file!
import java.io.*;
import java.util.*;

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