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: Excretion is the process of removing wastes and excess water from the body. 
Sentence2: parasites remove waste from their bodies.

Output: wastes


Input: Consider Input: Sentence1: After a seed is planted it is watered. 
Sentence2: seeds need water.

Output: seed


Input: Consider Input: Sentence1: Reproduction is the process by which living things give rise to offspring. 
Sentence2: Physiologically, sex is for the purpose of reproduction.


Output: Reproduction