You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Tuvalu

Context:
Each island has its own high-chief, or ulu-aliki, and several sub-chiefs (alikis). The community council is the Falekaupule (the traditional assembly of elders) or te sina o fenua (literally: "grey-hairs of the land"). In the past, another caste, the priests (tofuga), were also amongst the decision-makers. The ulu-aliki and aliki exercise informal authority at the local level. Ulu-aliki are always chosen based on ancestry. Under the Falekaupule Act (1997), the powers and functions of the Falekaupule are now shared with the pule o kaupule (elected village presidents; one on each atoll).

Question:
With what group do the falekaupule share power on Tuvalu?

pule o kaupule