import java.io.*;

class UserInput {
	public static BufferedReader commandLine = new BufferedReader(
			new InputStreamReader(System.in));

	public static char readChar() {
		String s = new String();

		try {
			s = commandLine.readLine();
		} catch (IOException e) {
			e.printStackTrace();
		}

		return s.charAt(0);
	}

	public static double readDouble() {
		String s = new String();

		try {
			s = commandLine.readLine();
		} catch (IOException e) {
			e.printStackTrace();
		}

		return Double.parseDouble(s);
	}

	public static int readInt() {
		String s = new String();

		try {
			s = commandLine.readLine();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return Integer.parseInt(s);
	}

	public static String readString() {
		String s = new String();

		try {
			s = commandLine.readLine();
		} catch (IOException e) {
			e.printStackTrace();
		}

		return s;
	}
}