Language: Java

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 *
 * @author Alan
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        OutputWriter out = new OutputWriter(outputStream);
        TaskA solver = new TaskA();
        solver.solve(1, in, out);
        out.close();
    }

    static class TaskA {
        public void solve(int testNumber, InputReader in, OutputWriter out) {
            int x = in.nextInt();
            if (x < 1200) out.printLine("ABC");
            else out.printLine("ARC");
        }

    }

    static class OutputWriter {
        private final PrintWriter writer;

        public OutputWriter(OutputStream outputStream) {
            writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));
        }

        public OutputWriter(Writer writer) {
            this.writer = new PrintWriter(writer);
        }

        public void printLine(String s) {
            writer.println(s);
        }

        public void close() {
            writer.close();
        }

    }

    static class InputReader {
        private InputStream stream;
        private byte[] buf = new byte[1024];
        private int curChar;
        private int numChars;
        private InputReader.SpaceCharFilter filter;

        public InputReader(InputStream stream) {
            this.stream = stream;
        }

        public int read() {
            if (numChars == -1) throw new InputMismatchException();
            if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new InputMismatchException();
                }
                if (numChars <= 0) return -1;
            }
            return buf[curChar++];
        }

        public int nextInt() {
            int c = read();
            while (isSpaceChar(c)) c = read();
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = read();
            }
            int res = 0;
            do {
                if (c < '0' || c > '9')
                    throw new InputMismatchException();
                res *= 10;
                res += c - '0';
                c = read();
            } while (!isSpaceChar(c));
            return res * sgn;
        }

        public boolean isSpaceChar(int c) {
            if (filter != null)
                return filter.isSpaceChar(c);
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }

        public interface SpaceCharFilter {
            boolean isSpaceChar(int ch);

        }

    }
}

Compiler output:
Main.java:28: error: cannot find symbol
        private final PrintWriter writer;
                      ^
  symbol:   class PrintWriter
  location: class OutputWriter
Main.java:30: error: cannot find symbol
        public OutputWriter(OutputStream outputStream) {
                            ^
  symbol:   class OutputStream
  location: class OutputWriter
Main.java:34: error: cannot find symbol
        public OutputWriter(Writer writer) {
                            ^
  symbol:   class Writer
  location: class OutputWriter
Main.java:49: error: cannot find symbol
        private InputStream stream;
                ^
  symbol:   class InputStream
  location: class InputReader
Main.java:55: error: cannot find symbol
        public InputReader(InputStream stream) {
                           ^
  symbol:   class InputStream
  location: class InputReader
Main.java:9: error: cannot find symbol
        InputStream inputStream = System.in;
        ^
  symbol:   class InputStream
  location: class Main
Main.java:10: error: cannot find symbol
        OutputStream outputStream = System.out;
        ^
  symbol:   class OutputStream
  location: class Main
Main.java:31: error: cannot find symbol
            writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));
                         ^
  symbol:   class PrintWriter
  location: class OutputWriter
Main.java:31: error: cannot find symbol
            writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));
                                         ^
  symbol:   class BufferedWriter
  location: class OutputWriter
Main.java:31: error: cannot find symbol
            writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));
                                                            ^
  symbol:   class OutputStreamWriter
  location: class OutputWriter
Main.java:35: error: cannot find symbol
            this.writer = new PrintWriter(writer);
                              ^
  symbol:   class PrintWriter
  location: class OutputWriter
Main.java:60: error: cannot find symbol
            if (numChars == -1) throw new InputMismatchException();
                                          ^
  symbol:   class InputMismatchException
  location: class InputReader
Main.java:65: error: cannot find symbol
                } catch (IOException e) {
                         ^
  symbol:   class IOException
  location: class InputReader
Main.java:66: error: cannot find symbol
                    throw new InputMismatchException();
                              ^
  symbol:   class InputMismatchException
  location: class InputReader
Main.java:84: error: cannot find symbol
                    throw new InputMismatchException();
                              ^
  symbol:   class InputMismatchException
  location: class InputReader
15 errors