Instructions: 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: Sentence 1:All trace of that entrance has vanished , for the whole southwestern section of the walls underwent many extensive alterations over the centuries . Sentence 2:However , that stretch of wall appeared in a print produced in the 18th century .
Output:
however