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: poisonous darts are used for defense by sea anemones. 
Sentence2: poisonous darts are used for protection by sea anemones.

Output: anemones


Input: Consider Input: Sentence1: Producers are organisms that produce food for themselves and other organisms. 
Sentence2: parasites obtain their food from producers that produces food for themselves and others.


Output: Producers