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 AV receiver is classified as an audio frequency electronic amplifier . Sentence 2:But with the rapid addition of several features , AV receivers now generally have significant additional functionality .

Ex Output:
but


Ex Input:
Sentence 1:Cragen and his detectives later determined that the wife of the boy 's biological father killed his mother and gave the baby to the adoption agency , where he was given a home . Sentence 2:In the end , the boy 's biological father won custody of him .

Ex Output:
in the end


Ex Input:
Sentence 1:The supporters of Fluminense Football Club are usually related to the upper classes of Rio de Janeiro . Sentence 2:However , the popularity of the club reaches beyond the city limits .

Ex Output:

however