using System;

public class Program

{

    public static void Main()

    {

        var s = "some string";

        var s1='s';

        var s2="s";

         if(s[0].Equals(s1))

         { Console.WriteLine("Ok s1!");

         }

         if(s[0].Equals(s2))

         { Console.WriteLine("Ok s2!");

         }

        Console.WriteLine(s.GetType());

        Console.WriteLine(s1.GetType());

        Console.WriteLine(s2.GetType());

        Console.WriteLine(s[0].GetType());

    }

}