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: zinc has a positive impact on the healing of wounds. 
Sentence2: oysters have a positive impact on the healing of wounds.

Output: has


Input: Consider Input: Sentence1: drought is when amount of precipitation decreases. 
Sentence2: Drought decreases the availability and abundance of the natural food supply.

Output: drought


Input: Consider Input: Sentence1: Digestive enzymes are necessary for a complete digestion. 
Sentence2: Enzymes break down food into components the body can absorb.


Output: enzymes