What will be the output of the following C# code?

{
    struct abc
    {
        int i;
    }
    class Program
    {
        static void Main(string[] args)
        {
            abc x = new abc();
            abc z;
            x.i = 10;
            z = x;
            z.i = 15;
            console.Writeline(x.i + "  " + y.i)
        }
    }
}