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

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

/* 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 inField = "";
 
        Pattern p = Pattern.compile("^(\\d*|\\s*)$");
        boolean isCorrect = p.matcher(inField).matches();
        System.out.println(isCorrect);
        
        inField = "   ";
        isCorrect = p.matcher(inField).matches();
        System.out.println(isCorrect);
        
        inField = "12345";
        isCorrect = p.matcher(inField).matches();
        System.out.println(isCorrect);
        
        inField = " 12345";
        isCorrect = p.matcher(inField).matches();
        System.out.println(isCorrect);
        
        inField = " 12345  ";
        isCorrect = p.matcher(inField).matches();
        System.out.println(isCorrect);
        
	}
}