using System;

public class Program

{

    static void printNum(int[] x) {

        for(int i = 0; i<x.Length; i++){

            if(x[i] < 0){

                return; 

            }

            if(x.Length > 1 && x[i]==0 && x[i+1]==0){ // To avoid error if x.Lenght is less than 2. 

                return; 

            }

            Console.WriteLine(x[i]); 

​

        }

    }

    public static void Main()

    {

        int[] a = {};

        printNum(a);

    }

}