import random

def sendSorteio(sorts=False):
	lista=['Joao','Kaue','Rafa','Riannamojanga']
	if not sorts:
		sorts=[]

	n=random.choice(lista)

	if n in sorts:
		sendSorteio(sorts)
		return None
	else:
		sorts.append(n)
		return n

print(sendSorteio())