using System;

public class Program

{

    public static void Main (string [] args)

    {

        int [,] arr={{1,2,3},{5,6,7},{9,10,12}};

        for (int i=0; i<arr.GetLength (0); i++)

        {

            for (int j=0; j<arr.GetLength (1); j++)

            {

              if (i %2==0)

              {

              Console.WriteLine(arr[i,j]);

              }

            }

        }

    }

}