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: Gravity is a force that pulls on things. 
Sentence2: A force that pulls on things pulls objects towards planets.

Ex Output:
force


Ex Input:
Sentence1: For example, in the sentence The rain destroyed the crops , The rain is the subject. 
Sentence2: If weather is stormy then there is a chance of destroyed crops.

Ex Output:
crops


Ex Input:
Sentence1: Producers are organisms that produce food for themselves and other organisms. 
Sentence2: Most plants are producers.

Ex Output:

Producers