using System;
 
class Pruebaout
{
    static void Partir(string nombreCompleto, out string nombre, out string apellido)
    {
        int i = nombreCompleto.LastIndexOf(' ');
        nombre = nombreCompleto.Substring(0, i);
        apellido = nombreCompleto.Substring(i + 1);
    }
 
    static void Main()
    {
        string a, b;
        Partir("Juan Ortiz", out a, out b);
        Console.WriteLine(a);               // Juan
        Console.WriteLine(b);               // Ortiz
    }
}

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