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.

Ex Input:
Sentence 1:The collector current does not remain constant with variation in temperature or power supply voltage . Sentence 2:Therefore , the operating point is unstable .

Ex Output:
therefore


Ex Input:
Sentence 1:Two days later , it was announced he and Borussia Dortmund would not be extending their contract after it expired after 30 July 2016 . Sentence 2:However , on 1 July 2015 , he signed a contract extension to keep him at the club until 2017 .

Ex Output:
however


Ex Input:
Sentence 1:Salih was among those tortured by Mansur . Sentence 2:Moreover , Salih was forced to divorce his wife and cousin Tarud , who was famed for her beauty , so that Mansur could wed her .

Ex Output:

moreover