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