/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
/* 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
	{
		String text = "chill hit donkey chicken car roast pink rat tree";
		String regex = "((?:\\w+\\W?){3})(?:(\\W+|$))";
		Matcher m = Pattern.compile(regex).matcher(text);
		while (m.find()) {
    		System.out.println(String.format("'%s'", m.group(1)));
		}
	}
}

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