import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		List<String> matches = new ArrayList<String>();
		Matcher m = Pattern.compile("\\B#\\w*[A-Za-z]\\w*")
			.matcher("#test @#$#test a#test,#2021, #__");
		while (m.find()) {
			matches.add(m.group());
		}
		
		System.out.println(String.join(",", matches));
	}
}