import java.math.BigInteger;
import java.util.Scanner;
class  Main{
  public   static  void main(String[]args){
Scanner in =new Scanner(System.in);
String s;
s=in.next();
if (s.equals("ABC"))
  System.out.print("ARC");
else  System.out.print("ABC");





  }
} import java.math.BigInteger; BigInteger java.math import java.util.Scanner; Scanner java.util class  Main{
  public   static  void main(String[]args){
Scanner in =new Scanner(System.in);
String s;
s=in.next();
if (s.equals("ABC"))
  System.out.print("ARC");
else  System.out.print("ABC");





  }
} Main public   static  void main(String[]args){
Scanner in =new Scanner(System.in);
String s;
s=in.next();
if (s.equals("ABC"))
  System.out.print("ARC");
else  System.out.print("ABC");





  } main {
Scanner in =new Scanner(System.in);
String s;
s=in.next();
if (s.equals("ABC"))
  System.out.print("ARC");
else  System.out.print("ABC");





  } Scanner in =new Scanner(System.in); in new Scanner(System.in) String s; s s=in.next() s in.next() in.next in if (s.equals("ABC"))
  System.out.print("ARC");
else  System.out.print("ABC"); s.equals("ABC") s.equals s "ABC" System.out.print("ARC") System.out.print System.out System System.out "ARC" System.out.print("ABC") System.out.print System.out System System.out "ABC" String[]args args
import java.math.BigInteger;
import java.util.Scanner;
class  Main{
  public   static  void main(String[]args){
Scanner in =new Scanner(System.in);
String s;
s=in.next();
if (s.equals("ABC"))
  System.out.print("ARC");
else  System.out.print("ABC");





  }
}