import java.util.*;
import java.lang.*;

class Main
{
	public static void main (String[] args) throws java.lang.Exception
	{
        int iloscWartosciDoWpisania = 4;
		Scanner czytnik = new Scanner(System.in);
        
        String[] wpisaneWartosci = new String[iloscWartosciDoWpisania];
        
        for (int i = 0; i < iloscWartosciDoWpisania; i++)
            wpisaneWartosci[i] = czytnik.nextLine();
            
        Arrays.sort(wpisaneWartosci);
        
        System.out.println(Arrays.asList(wpisaneWartosci));
	}
}