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: Heterotrophs get food by eating other living things. 
Sentence2: fish eat other living things.

Output: living


Input: Consider Input: Sentence1: Fish have a circulatory system with a two-chambered heart. 
Sentence2: Fish have a circulatory system with a heart that is divided.


Output: Fish