using System;

public class Program

{

    public static void Main(){

    string a="some text";

    Console.WriteLine(a.Length);

    string b="love one";

    Console.WriteLine(b.IndexOf('v'));

    b= b.Insert(0,"your my ");

    Console.WriteLine(b);

    a= a.Replace("one","two");

    Console.WriteLine(a);

                      }

}