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: Male dogs use pheromones in urine to mark their territory. 
Sentence2: Pheromones are hormones that are thought to stimulate, through smell, sexual reactions in animals.

Output: pheromones


Input: Consider Input: Sentence1: moss causes chemical weathering. 
Sentence2: If the moss was completely dried then it is dead.

Output: moss


Input: Consider Input: Sentence1: Insects spread disease and destroy crops. 
Sentence2: Locusts are amongst the most dramatic and devastating of the insect pests.


Output: Insects