//
//
// Keyboard
//
//
import java.io.*;

public class Keyboard 
{
private static BufferedReader keyboard=new BufferedReader(new InputStreamReader(System.in));

// toutes les méthodes sont des méthodes de classe (static)
public static char getChar()
	{
	return getString().charAt(0);
	}

public static String getString()
	{
	return getLine();
	}
public static int getInt()
	{
	int val;
	try{
		return Integer.parseInt(getLine());
	}catch(NumberFormatException e){ return -1;}
	}

public static void pause()
	{
	try{
		keyboard.read();
	}catch(IOException e){}
	}

private static String getLine()
	{
	String line;
	try{
		line=keyboard.readLine();
	}catch(IOException e){ return "";}
	return line;
	}

}