import java.util.Scanner;

class Input {
    public static void main (String[] args) {
	Scanner input = new Scanner(System.in);
	System.out.println("How old are you?");
	boolean invalidInput = true;

	while (invalidInput) {
	    invalidInput = !(input.hasNextInt());
	    if (invalidInput) {
		input.next();
		System.out.println("That wasn't a valid entry." + 
				   "  Retry, please.");
	    }
	}
	int age = input.nextInt();
	System.out.println("You are this many:  " + age);
    }
}