import java.util.Scanner;
public class AdderCheck
{
    //do this so the scanner is visible in all methods.
    private static final  Scanner scammer;
    static
    {
        scammer = new Scanner(System.in);
    }

    private static String getIntegerString()
    {
        //get a string from the user
        //do the nagging here.
        //NB:  get rid of whitespace on either side.
    }
    private static boolean isValidIntegerString(String n)
    {
        //check if it's a valid integer string (optional
        //+ or - followed by numbers
    }
    public static void main(String[] args)
    {
        //run the loop that gets all of the valid numbers
        //adds them, and does the output routine at the end.
    }
}