using System;

namespace Ex01
{
    class Program
    {
        public static void Main(string[] args)
        {
            Console.WriteLine("Hello World!");
            string s = "stroka1 stroka2 raydok3 sdfrq4 raydok3  raydok3";
            string s0 = "raydok3";
            string resultStr = s.Replace(s0,string.Empty);
            Console.WriteLine("НЕ ВІРНО {0}",resultStr);
            
            int position = s.IndexOf(s0,0); 
            if(position > -1)
            {
                resultStr = s.Remove(position,s0.Length);
            }
            Console.WriteLine("BIPHO {0}",resultStr);
            // TODO: Implement Functionality Here
            //Console.WriteLine(resultStr);
            Console.Write("Press any key to continue . . . ");
            Console.ReadKey(true);
        }
    }
}