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: moss causes chemical weathering. 
Sentence2: Sphagnum moss mixed with peat moss.

Output: moss


Input: Consider Input: Sentence1: a tape measure is used to measure length. 
Sentence2: Length The Base unit for length in the metric system is the meter .

Output: length


Input: Consider Input: Sentence1: Deposit feeders ingest sediment and extract food particles. 
Sentence2: earthworms ingest sediment and extract food particles to help form and enrich soil.


Output: extract