/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* 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 s = "#newline#  #newline# #newline##newline# #newline##newline##newline#";
		System.out.println(s.matches("#newline#(?:\\s*#newline#)+"));
	}
}