Generate an overlapping word between the given two sentences. When you find the overlapping words, they don't have to match exactly, e.g., "survival" and "survive" are valid overlapping words. Little words like "the" or "of" don't count! You must generate significant words which are not the stop words.

Ex Input:
Sentence1: Plants that shed their leaves seasonally each year are called deciduous plants. 
Sentence2: vines shed their leaves seasonally each year.

Ex Output:
each


Ex Input:
Sentence1: Hurricanes have wind speeds of at least 74 mph. 
Sentence2: anemometers can measure hurricanes.

Ex Output:
Hurricanes


Ex Input:
Sentence1: Sight is the ability to sense light, and the eye is the organ that senses light. 
Sentence2: Vision begins with sight.

Ex Output:

Sight