import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.*;
import java.lang.*;
import java.io.*;
 
 
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		String regex = "(?:^group |\\G(?!^))(\\S+)(?:\\s+|$)";
		String string = "group g1 l1 l2 l3 g2 g3.l1";
 
		Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE);
		Matcher matcher = pattern.matcher(string);
 
		while (matcher.find()) {
		    System.out.println(matcher.group(1));
		}
	}
}

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