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

import java.util.*;

/* 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 {
		Scanner reader = new Scanner(System.in);
		reader.useDelimiter("\\R");
		while(!reader.hasNext("^[\\w\\h-]+$")) {
			System.out.println("Please ensure you only enter letters, numbers, hyphen, underscore or whitespace");
			reader.next();
		}
		String name = reader.next();
		System.err.println("valid Input: " + name);		
		reader.close();
	}
}