cual es la tercera persona del plura??
In English the subject pronoun would be they. (ellos/ellas)
Of course, you know this, but for beginners in Spanish...
In Spanish the 3rd person plural verb ending is also used for the 2nd person, plural, formal (ustedes or you all). It is also used for the 2nd person, informal plural in Latin America. (vosotros in Spain).