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: Most genes contain the instructions for a single protein. 
Sentence2: Most genes contain the instructions for protein destinations.

Output: Most


Input: Consider Input: Sentence1: With a spatula, fold in flour mixture. 
Sentence2: a sifter is used for separating flour.

Output: flour


Input: Consider Input: Sentence1: Hair is a fiber that is found only in mammals. 
Sentence2: bears have hair.


Output: Hair