task 8 page 380

class MyClass
    {
        static void Main()
        {
            TwoClass one = new TwoClass("супер классный текст");
            Console.WriteLine(one);
            one.Insert(5, "NIKE");
            Console.WriteLine(one);
        }
    }
    class TwoClass
    {
        public string Text;
        public TwoClass(string txt)
        { Text = txt; }
        public void Insert(int n, string txt)
        {
            Text = Text.Insert(n, txt);
        }
        public override string ToString()
        {
            return Text;
        }
    }