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