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: Ozone depletion results in higher levels of UV radiation reaching Earth. 
Sentence2: less ozone means more ultraviolet light.

Output: Ozone


Input: Consider Input: Sentence1: Fish are the first known true chordates. 
Sentence2: Fish are the first known animal with a backbone.

Output: Fish


Input: Consider Input: Sentence1: Fungi are the only organisms that can decompose wood. 
Sentence2: Mushrooms are organisms known as fungi.


Output: Fungi