using System;

public class Program

{

    static void Retazec(string ret)

    {

        Console.WriteLine("dlzka je "+ ret.Trim().Length);

    public static void Main(string[] args)

    {

        Console.WriteLine("Zadajte retazec");

        string retazec = Console.ReadLine();

        Retazec(retazec);

        Console.ReadLine();

    }

    }

}

​