/* 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());
		}
	}
}

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