import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.*;
 
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		String input = "this is a sentence continents=Asia end continents=Europe end continents=Africa end continents=Australia end continents=South America end continents=North America end continents=Antartica end";
		Pattern pattern = Pattern.compile("(continents)=(.+?) end ");
		Matcher matcher = pattern.matcher(input);
		List<List<String>> lst = new ArrayList<>();
		while (matcher.find()){
			lst.add(Arrays.asList(matcher.group(1),matcher.group(2))); 
		} 
		System.out.println(lst);
 
	}
}

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