/* 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
	{
		// your code goes here
		String sToSearch = "This is a test\nAnother @pradyut@test ht@html.com\ntest\n#art\n@cool#paintings#collections";

	     Matcher mHashThenWord = Pattern.compile("(?<=@)\\w+\\b(?!\\.)").matcher(sToSearch);

    	 while(mHashThenWord.find())  {
        	System.out.println(mHashThenWord.group());
		}
	}
}