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: Heat and temperature are the same. 
Sentence2: a thermometer is used to measure heat.

Output: Heat


Input: Consider Input: Sentence1: if an object is kicked then force is exerted on that object. 
Sentence2: if an object is kicked then a measurement of newtons is exerted on that object.

Output: exerted


Input: Consider Input: Sentence1: Friction is a Force that opposes motion. 
Sentence2: A force that opposes motion is used for stopping vehicles by brakes.


Output: Force