using System;

public class Program

{

    public static void Main()

    {

        int[] a = {1, 5, 17, 2, 9, 2};

        int largestNumber = 0;

        int secondLargest = 0;

        for(var i=0; i < a.Length; i++)

        {

            if(a[i] > largestNumber)

            {

                secondLargest = largestNumber;

              largestNumber = a[i]; 

            }

            if(largestNumber != a[i] && secondLargest < a[i])

            {

              secondLargest = a[i]; 

            }

        }

        Console.WriteLine("Second Largest Number : " + secondLargest);

    }

}