import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        System.out.println("Podaj zdanie: ");
        String sentence = scan.nextLine();

        if (sentence == null) {
            System.out.println("Wpisz zdanie jeszcze raz.");
            String newSentence = scan.nextLine();
            System.out.println(newSentence);
        } else {
            System.out.println(sentence);
        }
    }
}