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: a pulley is used for lifting objects. 
Sentence2: Resistance exercises are weight-lifting exercises.

Output: lifting


Input: Consider Input: Sentence1: Ribosomes are small organelles where proteins are made. 
Sentence2: Ribosomes are assembled inside the nucleus.

Output: Ribosomes


Input: Consider Input: Sentence1: Plants detect and respond to the daily cycle of light and darkness. 
Sentence2: All daily cycles of the celestial objects are caused by the rotation of the Earth.


Output: cycle