import java.io.BufferedReader;
import java.io.IOException;
import java.io.PrintWriter;

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

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

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

        br.close();
        pw.close();
    } main {
        BufferedReader br = new BufferedReader(new java.io.InputStreamReader(System.in));
        PrintWriter pw = new PrintWriter(System.out);
        
        String S = br.readLine();
        
        if(S.equals("ABC")) {
            pw.println("ARC");
        } else {
            pw.println("ABC");
        }

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

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

        br.close();
        pw.close();
    }
} Main
import java.io.BufferedReader;
import java.io.IOException;
import java.io.PrintWriter;

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

        br.close();
        pw.close();
    }
}