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: Producers make food from inorganic molecules. 
Sentence2: Decomposition is the breakdown of organic molecules into inorganic molecules.

Output: inorganic


Input: Consider Input: Sentence1: Mad Cow disease is a concern. 
Sentence2: pathogens can cause Mad Cow.

Output: Cow


Input: Consider Input: Sentence1: Cell phones are a distraction to driving. 
Sentence2: Using a cell phone while driving can cause crashes.


Output: Cell