/* 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 void main (String[] args) throws java.lang.Exception
	{
		ArrayList<Boolean> list =  new ArrayList<Boolean>();
 
        list.add(true);
        list.add(false);
        list.add(true);
        list.add(false);
 
        Collections.sort(list);
        for (Boolean s : list) {
		    System.out.println(s);
		}
	}
}

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