using System;

using System.Collections.Generic;

using System.Linq;

using System.Text.RegularExpressions;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello!");

        string greeting = Console.ReadLine();

        if (CheckStringExists("hello how are you", greeting))

        {

            Console.WriteLine("I am good");

        }

    }

    public static bool CheckStringExists(string input, string userInput)

    {

        var inputArray = input.ToLower().Split(' ');

        var userInputArray = userInput.ToLower().Split(' ');

​

        int i = 0, j = 0;

        while (i < inputArray.Length && j < userInputArray.Length)

        {

            if (inputArray[i] == userInputArray[j])

            {

                i++;

            }

            j++;

        }

​

        return i == inputArray.Length;

    }

}