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: Stress is the applied force, strain is the change in shape. 
Sentence2: Paper is crumbled when stress and strain is applied in order to change the shape.

Output: Stress


Input: Consider Input: Sentence1: Muscles can only contract. 
Sentence2: Contraction is a type of movement.

Output: contract


Input: Consider Input: Sentence1: Most bryophytes are small. 
Sentence2: most mosses, liverworts, and hornworts are small.


Output: Most