/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.Scanner;

/* Name of the class has to be "Main" only if the class is public. */
class Ideone {

    public static void main(String[] args) {

	    String podajPIN;
	    String PIN = "0999";
	
	    System.out.println("Podaj PIN");
	    podajPIN = getString(PIN);
	
	    if (podajPIN == PIN) {
	        System.out.println("Podałeś dobry PIN");
	    } else {
	        System.out.println("Podany PIN jest nieprawidłowy");
	    }
    }

	public static String getString(String pattern) { 
		String found = new Scanner(System.in).findInLine("^"+pattern+"$");
		return pattern.equals(found) ? pattern : null; 
	}
	
}