/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static boolean isInt(String strNum) {
    	return strNum.matches("-?\\d+");
	}
	public static void main (String[] args) throws java.lang.Exception
	{
		Scanner sc = new Scanner(System.in);
 
		int luckyNumber = 3;
		String userInput = "";
		int userNumber = 0;
 
		System.out.println("Podaj liczbę: ");
 
		while (true) {
			userInput = sc.nextLine();
 
			if (!isInt(userInput)) { // walidacja!
				System.out.println("Podno niepoprawna liczbe!");
				continue;
			}
 
			userNumber = Integer.parseInt(userInput);
 
			if (userNumber!=luckyNumber) {
				System.out.println("zgaduj jeszcze raz: ");
			}
			else {
				System.out.println("Dobrze!");
				break;
			}
		}
	}
}

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MQotNwp6dWEgbGljaGJhCjQKLTMKMw==

1
-7
zua lichba
4
-3
3