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: Producers make food from inorganic molecules. 
Sentence2: Decomposition is the breakdown of organic molecules into inorganic molecules.

Output: inorganic


Input: Consider Input: Sentence1: Urine leaves the body through a sphincter in the process of urination. 
Sentence2: urine leaves the body upon relaxation of a muscle.

Output: Urine


Input: Consider Input: Sentence1: Macroevolution is evolution over geologic time above the level of the species. 
Sentence2: Microevolution leading to macroevolution, discussed earlier, is one example.


Output: evolution