using System;

using System.Linq;

using System.Text.RegularExpressions;

​

public class Program

{

    public static void Main()

    {

        string str = "SomethingIsReallyGood";

        string[] split = Regex.Split(str, @"(?<!^)(?=[A-Z])");

        foreach (string s in split)

        {

            Console.WriteLine(s);

        }

​

        Console.WriteLine("Longest String");

        var words = "This is a longest word in the statement and statement".Split(' ');

        var longestWords = words.Where(w => w.Length == words.Max(m => m.Length)).Distinct();

        Console.WriteLine("Longest words are: {0}", string.Join(", ", longestWords.ToArray()));

        Console.WriteLine("smallest String");

        words = "This is a longest word in the statement and statement".Split(' ');

        var smallestWords = words.Where(w => w.Length == words.Min(m => m.Length)  ).Distinct();

        Console.WriteLine("Smallest words are: {0}", string.Join(", ", smallestWords.ToArray()));

    }

}