import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String[] str = br.readLine().split(" ");
        if ("ABC".equals(str[0])) {
            System.out.println("ARC");
        } else {
            System.out.println("ABC");
        }

    }
} import java.io.BufferedReader; BufferedReader java.io import java.io.IOException; IOException java.io import java.io.InputStreamReader; InputStreamReader java.io public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String[] str = br.readLine().split(" ");
        if ("ABC".equals(str[0])) {
            System.out.println("ARC");
        } else {
            System.out.println("ABC");
        }

    }
} Main public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String[] str = br.readLine().split(" ");
        if ("ABC".equals(str[0])) {
            System.out.println("ARC");
        } else {
            System.out.println("ABC");
        }

    } main {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String[] str = br.readLine().split(" ");
        if ("ABC".equals(str[0])) {
            System.out.println("ARC");
        } else {
            System.out.println("ABC");
        }

    } BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); br new BufferedReader(new InputStreamReader(System.in)) String[] str = br.readLine().split(" "); str br.readLine().split(" ") br.readLine().split br.readLine() br.readLine br " " if ("ABC".equals(str[0])) {
            System.out.println("ARC");
        } else {
            System.out.println("ABC");
        } "ABC".equals(str[0]) "ABC".equals "ABC" str[0] str 0 {
            System.out.println("ARC");
        } System.out.println("ARC") System.out.println System.out System System.out "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) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String[] str = br.readLine().split(" ");
        if ("ABC".equals(str[0])) {
            System.out.println("ARC");
        } else {
            System.out.println("ABC");
        }

    }
} public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String[] str = br.readLine().split(" ");
        if ("ABC".equals(str[0])) {
            System.out.println("ARC");
        } else {
            System.out.println("ABC");
        }

    }
} Main
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String[] str = br.readLine().split(" ");
        if ("ABC".equals(str[0])) {
            System.out.println("ARC");
        } else {
            System.out.println("ABC");
        }

    }
}
