/* package whatever; // don't place package name! */
 
import java.util.*;
import java.util.regex.*;
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[] numbers = {"", "12345", "00000", "100000", "000001", "010"};
 
		for (String n : numbers) {
			System.out.printf("Number '%s' -> valid %s\n", n, employeeNumberCheck(n));
		}
	}
 
    private static final Pattern validEmployeeNumber = Pattern.compile("^[0-9]*[1-9][0-9]*$");
 
    private static boolean employeeNumberCheck(String employeeNumber){
        return validEmployeeNumber.matcher(employeeNumber).matches();
    }	
 
}

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