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: Insects spread disease and destroy crops. 
Sentence2: Crops are plants that are grown for food or other uses.

Output: crops


Input: Consider Input: Sentence1: Mammals generate heat mainly by keeping their metabolic rate high. 
Sentence2: food keeps mammals' metabolic rates high.

Output: Mammals


Input: Consider Input: Sentence1: if all members of a species cannot produce offspring then that species will likely become extinct. 
Sentence2: if all members of a species cannot produce offspring it ffect biological diversity.


Output: all