Input (grade 8): Lacoste is a commune in the Vaucluse department in the Provence-Alpes-C Ã te d'Azur region in southeastern France.
Output (grade 5): Lacoste is a commune of 408 people (1999). It is located in the region Provence-Alpes-C Ã te d'Azur in the Vaucluse department in the south of France.