import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

class Main {

    public static void main(String[] args) throws Exception {

        try (BufferedReader br = new BufferedReader(new InputStreamReader(System.in));) {
            String ans = br.readLine();
            if (ans.equals("ABC")) {
                ans = "ARC";
            } else {
                ans = "ABC";
            }
            System.out.println(ans);
        } catch (IOException | NumberFormatException e) {
            e.printStackTrace();
            System.exit(0);
        } catch (final Exception e) {
            e.printStackTrace();
            System.exit(0);
        }
    }
} import java.io.BufferedReader; BufferedReader java.io import java.io.IOException; IOException java.io import java.io.InputStreamReader; InputStreamReader java.io import java.util.ArrayList; ArrayList java.util import java.util.Arrays; Arrays java.util import java.util.List; List java.util class Main {

    public static void main(String[] args) throws Exception {

        try (BufferedReader br = new BufferedReader(new InputStreamReader(System.in));) {
            String ans = br.readLine();
            if (ans.equals("ABC")) {
                ans = "ARC";
            } else {
                ans = "ABC";
            }
            System.out.println(ans);
        } catch (IOException | NumberFormatException e) {
            e.printStackTrace();
            System.exit(0);
        } catch (final Exception e) {
            e.printStackTrace();
            System.exit(0);
        }
    }
} Main public static void main(String[] args) throws Exception {

        try (BufferedReader br = new BufferedReader(new InputStreamReader(System.in));) {
            String ans = br.readLine();
            if (ans.equals("ABC")) {
                ans = "ARC";
            } else {
                ans = "ABC";
            }
            System.out.println(ans);
        } catch (IOException | NumberFormatException e) {
            e.printStackTrace();
            System.exit(0);
        } catch (final Exception e) {
            e.printStackTrace();
            System.exit(0);
        }
    } main {

        try (BufferedReader br = new BufferedReader(new InputStreamReader(System.in));) {
            String ans = br.readLine();
            if (ans.equals("ABC")) {
                ans = "ARC";
            } else {
                ans = "ABC";
            }
            System.out.println(ans);
        } catch (IOException | NumberFormatException e) {
            e.printStackTrace();
            System.exit(0);
        } catch (final Exception e) {
            e.printStackTrace();
            System.exit(0);
        }
    } try (BufferedReader br = new BufferedReader(new InputStreamReader(System.in));) {
            String ans = br.readLine();
            if (ans.equals("ABC")) {
                ans = "ARC";
            } else {
                ans = "ABC";
            }
            System.out.println(ans);
        } catch (IOException | NumberFormatException e) {
            e.printStackTrace();
            System.exit(0);
        } catch (final Exception e) {
            e.printStackTrace();
            System.exit(0);
        } catch (IOException | NumberFormatException e) {
            e.printStackTrace();
            System.exit(0);
        } IOException | NumberFormatException e {
            e.printStackTrace();
            System.exit(0);
        } e.printStackTrace() e.printStackTrace e System.exit(0) System.exit System 0 catch (final Exception e) {
            e.printStackTrace();
            System.exit(0);
        } final Exception e {
            e.printStackTrace();
            System.exit(0);
        } e.printStackTrace() e.printStackTrace e System.exit(0) System.exit System 0 {
            String ans = br.readLine();
            if (ans.equals("ABC")) {
                ans = "ARC";
            } else {
                ans = "ABC";
            }
            System.out.println(ans);
        } BufferedReader br = new BufferedReader(new InputStreamReader(System.in)) BufferedReader br = new BufferedReader(new InputStreamReader(System.in)) new BufferedReader(new InputStreamReader(System.in)) String ans = br.readLine(); ans br.readLine() br.readLine br if (ans.equals("ABC")) {
                ans = "ARC";
            } else {
                ans = "ABC";
            } ans.equals("ABC") ans.equals ans "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
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

class Main {

    public static void main(String[] args) throws Exception {

        try (BufferedReader br = new BufferedReader(new InputStreamReader(System.in));) {
            String ans = br.readLine();
            if (ans.equals("ABC")) {
                ans = "ARC";
            } else {
                ans = "ABC";
            }
            System.out.println(ans);
        } catch (IOException | NumberFormatException e) {
            e.printStackTrace();
            System.exit(0);
        } catch (final Exception e) {
            e.printStackTrace();
            System.exit(0);
        }
    }
}