d

using System;

class A{
    public string [] tab=new string [];

    public string this [int x]{
        get {return tab[i];}
        set {tab[x]=value;}
    }
    public int this [string a]
    {
        get
        {Console.WriteLine("x",+tab.Length);
         for (i=0;int<100;i++)
            if(tab[i])==a)
            return i;
        }
    }
}
{
    class Program
    {
        static void Main(string[] args)
        {
            A a=new A();
            a tab[0] = "Ala";
            a tab[1] = "Tak";
            a tab[2] = "Rak";
            a tab[3] = "Tok";
            a tab[4] = "Kot";
            a tab[5] = "Ala";
            a tab[6] = "Nie";
            a tab[7] = "Ala";
            a tab[8] = "tyk";
            a tab[9] = "pyk";
            a [10] = "Jan";
            for (int=0;int<11;i++)
                Console.WriteLine(a[i]);
            Console.WriteLine(a["Jan"]);
            Console.WriteLine(a["abc"]);
        }
    }
}