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.

Input: Consider Input: Sentence1: the ovaries are used in reproduction. 
Sentence2: Egg released by the ovary.

Output: ovaries


Input: Consider Input: Sentence1: an animal requires nutrients to grow and heal. 
Sentence2: Microbes can help an animal to grow and heal.

Output: grow


Input: Consider Input: Sentence1: Earthworms are important deposit feeders that help form and enrich soil. 
Sentence2: Earthworms are important deposit feeders that help form and add organic material to soil.


Output: Earthworms