import java.io.*;
import java.util.StringTokenizer;

public class Main {

    public static void main(String[] args) {
        FastScanner in = new FastScanner();
        PrintWriter out = new PrintWriter(System.out, true);
//        int t = in.nextInt();
//        while (t-- > 0)
        solve(in, out);
        out.close();
    }

    public static void solve(FastScanner in, PrintWriter out) {
        String str = in.nextToken();
        System.out.println(str.equals("ABC")?"ARC":"ABC");
    }


    static class FastScanner {
        BufferedReader br;
        StringTokenizer st;

        public FastScanner() {
            init();
        }

        public FastScanner(String name) {
            init(name);
        }

        public FastScanner(boolean isOnlineJudge) {
            if (!isOnlineJudge || System.getProperty("ONLINE_JUDGE") != null) {
                init();
            } else {
                init("input.txt");
            }
        }

        private void init() {
            br = new BufferedReader(new InputStreamReader(System.in));
        }

        private void init(String name) {
            try {
                br = new BufferedReader(new FileReader(name));
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
        }

        public String nextToken() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        public int nextInt() {
            return Integer.parseInt(nextToken());
        }


        public long nextLong() {
            return Long.parseLong(nextToken());
        }

        public double nextDouble() {
            return Double.parseDouble(nextToken());
        }

    }

}


 import java.io.*; io.* java import java.util.StringTokenizer; StringTokenizer java.util public class Main {

    public static void main(String[] args) {
        FastScanner in = new FastScanner();
        PrintWriter out = new PrintWriter(System.out, true);
//        int t = in.nextInt();
//        while (t-- > 0)
        solve(in, out);
        out.close();
    }

    public static void solve(FastScanner in, PrintWriter out) {
        String str = in.nextToken();
        System.out.println(str.equals("ABC")?"ARC":"ABC");
    }


    static class FastScanner {
        BufferedReader br;
        StringTokenizer st;

        public FastScanner() {
            init();
        }

        public FastScanner(String name) {
            init(name);
        }

        public FastScanner(boolean isOnlineJudge) {
            if (!isOnlineJudge || System.getProperty("ONLINE_JUDGE") != null) {
                init();
            } else {
                init("input.txt");
            }
        }

        private void init() {
            br = new BufferedReader(new InputStreamReader(System.in));
        }

        private void init(String name) {
            try {
                br = new BufferedReader(new FileReader(name));
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
        }

        public String nextToken() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        public int nextInt() {
            return Integer.parseInt(nextToken());
        }


        public long nextLong() {
            return Long.parseLong(nextToken());
        }

        public double nextDouble() {
            return Double.parseDouble(nextToken());
        }

    }

} Main public static void main(String[] args) {
        FastScanner in = new FastScanner();
        PrintWriter out = new PrintWriter(System.out, true);
//        int t = in.nextInt();
//        while (t-- > 0)
        solve(in, out);
        out.close();
    } main {
        FastScanner in = new FastScanner();
        PrintWriter out = new PrintWriter(System.out, true);
//        int t = in.nextInt();
//        while (t-- > 0)
        solve(in, out);
        out.close();
    } FastScanner in = new FastScanner(); in new FastScanner() PrintWriter out = new PrintWriter(System.out, true); out new PrintWriter(System.out, true) solve(in, out) solve in out out.close() out.close out String[] args args public static void solve(FastScanner in, PrintWriter out) {
        String str = in.nextToken();
        System.out.println(str.equals("ABC")?"ARC":"ABC");
    } solve {
        String str = in.nextToken();
        System.out.println(str.equals("ABC")?"ARC":"ABC");
    } String str = in.nextToken(); str in.nextToken() in.nextToken in System.out.println(str.equals("ABC")?"ARC":"ABC") System.out.println System.out System System.out str.equals("ABC")?"ARC":"ABC" str.equals("ABC") str.equals str "ABC" "ARC" "ABC" FastScanner in in PrintWriter out out static class FastScanner {
        BufferedReader br;
        StringTokenizer st;

        public FastScanner() {
            init();
        }

        public FastScanner(String name) {
            init(name);
        }

        public FastScanner(boolean isOnlineJudge) {
            if (!isOnlineJudge || System.getProperty("ONLINE_JUDGE") != null) {
                init();
            } else {
                init("input.txt");
            }
        }

        private void init() {
            br = new BufferedReader(new InputStreamReader(System.in));
        }

        private void init(String name) {
            try {
                br = new BufferedReader(new FileReader(name));
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
        }

        public String nextToken() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        public int nextInt() {
            return Integer.parseInt(nextToken());
        }


        public long nextLong() {
            return Long.parseLong(nextToken());
        }

        public double nextDouble() {
            return Double.parseDouble(nextToken());
        }

    } FastScanner BufferedReader br; br StringTokenizer st; st public FastScanner() {
            init();
        } FastScanner {
            init();
        } init() init public FastScanner(String name) {
            init(name);
        } FastScanner {
            init(name);
        } init(name) init name String name name public FastScanner(boolean isOnlineJudge) {
            if (!isOnlineJudge || System.getProperty("ONLINE_JUDGE") != null) {
                init();
            } else {
                init("input.txt");
            }
        } FastScanner {
            if (!isOnlineJudge || System.getProperty("ONLINE_JUDGE") != null) {
                init();
            } else {
                init("input.txt");
            }
        } if (!isOnlineJudge || System.getProperty("ONLINE_JUDGE") != null) {
                init();
            } else {
                init("input.txt");
            } !isOnlineJudge || System.getProperty("ONLINE_JUDGE") != null !isOnlineJudge isOnlineJudge System.getProperty("ONLINE_JUDGE") != null System.getProperty("ONLINE_JUDGE") System.getProperty System "ONLINE_JUDGE" null {
                init();
            } init() init {
                init("input.txt");
            } init("input.txt") init "input.txt" boolean isOnlineJudge isOnlineJudge private void init() {
            br = new BufferedReader(new InputStreamReader(System.in));
        } init {
            br = new BufferedReader(new InputStreamReader(System.in));
        } br = new BufferedReader(new InputStreamReader(System.in)) br new BufferedReader(new InputStreamReader(System.in)) private void init(String name) {
            try {
                br = new BufferedReader(new FileReader(name));
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
        } init {
            try {
                br = new BufferedReader(new FileReader(name));
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
        } try {
                br = new BufferedReader(new FileReader(name));
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } FileNotFoundException e {
                e.printStackTrace();
            } e.printStackTrace() e.printStackTrace e {
                br = new BufferedReader(new FileReader(name));
            } br = new BufferedReader(new FileReader(name)) br new BufferedReader(new FileReader(name)) String name name public String nextToken() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        } nextToken {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        } while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            } st == null || !st.hasMoreElements() st == null st null !st.hasMoreElements() st.hasMoreElements() st.hasMoreElements st {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            } try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                } IOException e {
                    e.printStackTrace();
                } e.printStackTrace() e.printStackTrace e {
                    st = new StringTokenizer(br.readLine());
                } st = new StringTokenizer(br.readLine()) st new StringTokenizer(br.readLine()) return st.nextToken(); st.nextToken() st.nextToken st public int nextInt() {
            return Integer.parseInt(nextToken());
        } nextInt {
            return Integer.parseInt(nextToken());
        } return Integer.parseInt(nextToken()); Integer.parseInt(nextToken()) Integer.parseInt Integer nextToken() nextToken public long nextLong() {
            return Long.parseLong(nextToken());
        } nextLong {
            return Long.parseLong(nextToken());
        } return Long.parseLong(nextToken()); Long.parseLong(nextToken()) Long.parseLong Long nextToken() nextToken public double nextDouble() {
            return Double.parseDouble(nextToken());
        } nextDouble {
            return Double.parseDouble(nextToken());
        } return Double.parseDouble(nextToken()); Double.parseDouble(nextToken()) Double.parseDouble Double nextToken() nextToken public class Main {

    public static void main(String[] args) {
        FastScanner in = new FastScanner();
        PrintWriter out = new PrintWriter(System.out, true);
//        int t = in.nextInt();
//        while (t-- > 0)
        solve(in, out);
        out.close();
    }

    public static void solve(FastScanner in, PrintWriter out) {
        String str = in.nextToken();
        System.out.println(str.equals("ABC")?"ARC":"ABC");
    }


    static class FastScanner {
        BufferedReader br;
        StringTokenizer st;

        public FastScanner() {
            init();
        }

        public FastScanner(String name) {
            init(name);
        }

        public FastScanner(boolean isOnlineJudge) {
            if (!isOnlineJudge || System.getProperty("ONLINE_JUDGE") != null) {
                init();
            } else {
                init("input.txt");
            }
        }

        private void init() {
            br = new BufferedReader(new InputStreamReader(System.in));
        }

        private void init(String name) {
            try {
                br = new BufferedReader(new FileReader(name));
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
        }

        public String nextToken() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        public int nextInt() {
            return Integer.parseInt(nextToken());
        }


        public long nextLong() {
            return Long.parseLong(nextToken());
        }

        public double nextDouble() {
            return Double.parseDouble(nextToken());
        }

    }

} public class Main {

    public static void main(String[] args) {
        FastScanner in = new FastScanner();
        PrintWriter out = new PrintWriter(System.out, true);
//        int t = in.nextInt();
//        while (t-- > 0)
        solve(in, out);
        out.close();
    }

    public static void solve(FastScanner in, PrintWriter out) {
        String str = in.nextToken();
        System.out.println(str.equals("ABC")?"ARC":"ABC");
    }


    static class FastScanner {
        BufferedReader br;
        StringTokenizer st;

        public FastScanner() {
            init();
        }

        public FastScanner(String name) {
            init(name);
        }

        public FastScanner(boolean isOnlineJudge) {
            if (!isOnlineJudge || System.getProperty("ONLINE_JUDGE") != null) {
                init();
            } else {
                init("input.txt");
            }
        }

        private void init() {
            br = new BufferedReader(new InputStreamReader(System.in));
        }

        private void init(String name) {
            try {
                br = new BufferedReader(new FileReader(name));
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
        }

        public String nextToken() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        public int nextInt() {
            return Integer.parseInt(nextToken());
        }


        public long nextLong() {
            return Long.parseLong(nextToken());
        }

        public double nextDouble() {
            return Double.parseDouble(nextToken());
        }

    }

} Main
import java.io.*;
import java.util.StringTokenizer;

public class Main {

    public static void main(String[] args) {
        FastScanner in = new FastScanner();
        PrintWriter out = new PrintWriter(System.out, true);
//        int t = in.nextInt();
//        while (t-- > 0)
        solve(in, out);
        out.close();
    }

    public static void solve(FastScanner in, PrintWriter out) {
        String str = in.nextToken();
        System.out.println(str.equals("ABC")?"ARC":"ABC");
    }


    static class FastScanner {
        BufferedReader br;
        StringTokenizer st;

        public FastScanner() {
            init();
        }

        public FastScanner(String name) {
            init(name);
        }

        public FastScanner(boolean isOnlineJudge) {
            if (!isOnlineJudge || System.getProperty("ONLINE_JUDGE") != null) {
                init();
            } else {
                init("input.txt");
            }
        }

        private void init() {
            br = new BufferedReader(new InputStreamReader(System.in));
        }

        private void init(String name) {
            try {
                br = new BufferedReader(new FileReader(name));
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
        }

        public String nextToken() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        public int nextInt() {
            return Integer.parseInt(nextToken());
        }


        public long nextLong() {
            return Long.parseLong(nextToken());
        }

        public double nextDouble() {
            return Double.parseDouble(nextToken());
        }

    }

}



