using System;

using System.Text.RegularExpressions;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        int[] arr = {70,20,30,40};

        List<char> ch_str = new List<char>() {'a','e','i','o','u'};

        string str  ="how are you";

        str = Regex.Replace(str,"[aeiou]","");

        Console.WriteLine(str);

        Array.Sort(arr);

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

            Console.WriteLine(arr[i]);

        }

        int largest = int.MinValue  , secondlargest = int.MinValue;

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

            largest = Math.Max(largest,arr[i]);

        }

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

            if(arr[i]!=largest)

            secondlargest = Math.Max(secondlargest,arr[i]);

        }

        Console.WriteLine(secondlargest);

    }

}