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: evaporation can be used for separating a solute from a solvent in a solution. 
Sentence2: Evaporation can be used for segregation a solute from a solvent in a solution.

Output: a


Input: Consider Input: Sentence1: Asbestos is a dangerous carcinogen. 
Sentence2: Asbestos causes cancer.

Output: Asbestos


Input: Consider Input: Sentence1: a doorbell converts electrical energy into sound. 
Sentence2: a doorbell converts electrical energy into a chime.


Output: converts