using System;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Enter a string:");

        string input = Console.ReadLine();

​

        string[] words = input.Split(' ');

        string longestWord = "";

​

        foreach (string word in words)

        {

            if (word.Length > longestWord.Length)

            {

                longestWord = word;

            }

        }

​

        Console.WriteLine("The longest word in the string is: " + longestWord);

    }

}

​