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: Flies are insects with two wings. 
Sentence2: Flies are arthropods with two wings.

Output: Flies


Input: Consider Input: Sentence1: Lymph is a fluid that leaks out of capillaries into spaces between cells. 
Sentence2: Lymph is a fluid that leaks out of the connection of arteries to veins.


Output: Lymph