/* 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
	{
		String text = "####THIS_IS_A_HASHTAG;;;#This_1_2...#12_and_this ";
		String regex = "#[A-Za-z0-9_]+";
 
         Matcher m = Pattern.compile(regex).matcher(text);
 
 while (m.find()) {
   System.out.println(m.group());
 }
 
    }
}

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