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: Enveloped viruses make their own membranes. 
Sentence2: Some viruses make their own membranes.

Ex Output:
make


Ex Input:
Sentence1: Interest in fossils is worldwide. 
Sentence2: paleontologists study something with worldwide interest.

Ex Output:
Interest


Ex Input:
Sentence1: Breath, food and proper rest is primary to health. 
Sentence2: food has a positive impact on health.

Ex Output:

food