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: Some viruses live in a dormant state inside the body. 
Sentence2: a virus can live in the brain.

Ex Output:
viruses


Ex Input:
Sentence1: Sweat glands produce more sweat. 
Sentence2: When the body is hot, something coming from a gland is produced to cool the body.

Ex Output:
glands


Ex Input:
Sentence1: Humans start most wildfires. 
Sentence2: humans can change ecosystems drastically.

Ex Output:

Humans