In this task, you are given two sentences in the English language (Sentence 1 and Sentence 2). Your task is to identify the connecting word between the two sentences.

Input: Consider Input: Sentence 1:The symplectic group acts transitively on complex structures by conjugation . Sentence 2:Moreover , the subgroup commuting with J is naturally identified with the unitary group for the corresponding complex inner product space .

Output: moreover

Input: Consider Input: Sentence 1:On the overground parts of the network trams drive at sight , while the underground premetro sections have block signalling . Sentence 2:However drivers do not need to check in and out of the signalled section as on the Muni system in San Francisco .

Output: however

Input: Consider Input: Sentence 1:Albie wakes in the night to go to the bathroom . Sentence 2:But when he gets there , he finds that the bathroom fixtures have been removed .
Output: but