import java.util.Scanner;

public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    String S = sc.next();
    String ans;
    if(S.contentEquals("ABC")) {
    	ans = "ARC";
    }else {
    	ans = "ABC";
    }
    System.out.println(ans);
  }
} import java.util.Scanner; Scanner java.util public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    String S = sc.next();
    String ans;
    if(S.contentEquals("ABC")) {
    	ans = "ARC";
    }else {
    	ans = "ABC";
    }
    System.out.println(ans);
  }
} Main public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    String S = sc.next();
    String ans;
    if(S.contentEquals("ABC")) {
    	ans = "ARC";
    }else {
    	ans = "ABC";
    }
    System.out.println(ans);
  } main {
    Scanner sc = new Scanner(System.in);
    String S = sc.next();
    String ans;
    if(S.contentEquals("ABC")) {
    	ans = "ARC";
    }else {
    	ans = "ABC";
    }
    System.out.println(ans);
  } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String S = sc.next(); S sc.next() sc.next sc String ans; ans if(S.contentEquals("ABC")) {
    	ans = "ARC";
    }else {
    	ans = "ABC";
    } S.contentEquals("ABC") S.contentEquals S "ABC" {
    	ans = "ARC";
    } ans = "ARC" ans "ARC" {
    	ans = "ABC";
    } ans = "ABC" ans "ABC" System.out.println(ans) System.out.println System.out System System.out ans String[] args args public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    String S = sc.next();
    String ans;
    if(S.contentEquals("ABC")) {
    	ans = "ARC";
    }else {
    	ans = "ABC";
    }
    System.out.println(ans);
  }
} public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    String S = sc.next();
    String ans;
    if(S.contentEquals("ABC")) {
    	ans = "ARC";
    }else {
    	ans = "ABC";
    }
    System.out.println(ans);
  }
} Main
import java.util.Scanner;

public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    String S = sc.next();
    String ans;
    if(S.contentEquals("ABC")) {
    	ans = "ARC";
    }else {
    	ans = "ABC";
    }
    System.out.println(ans);
  }
}