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.

Ex Input:
Sentence1: the force of water against the seed coat causes a root to emerge from a seed. 
Sentence2: Germination depends on the seed coat.

Ex Output:
coat


Ex Input:
Sentence1: killing microorganisms in food can be used to extend the shelf life of that food. 
Sentence2: Cooking can be used to extend the shelf life of food.

Ex Output:
be


Ex Input:
Sentence1: Temperature Temperature is an measurement of the amount of heat. 
Sentence2: Climate is described as the measurement of heat.

Ex Output:

heat