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: Some herbivores have more than one stomach. 
Sentence2: Camels are an herbivore.

Output: herbivores


Input: Consider Input: Sentence1: Many plants respond to the days growing shorter in the fall by going dormant. 
Sentence2: Many plants respond to the autumnal equinox by going dormant.

Output: Many


Input: Consider Input: Sentence1: the uterus is used in reproduction. 
Sentence2: Embryo are transferred to a place used in reproduction.


Output: reproduction