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.

Ex Input:
Sentence1: moss causes chemical weathering. 
Sentence2: If the moss was completely dried then it is dead.

Ex Output:
moss


Ex Input:
Sentence1: Sweat glands produce more sweat. 
Sentence2: When the body is hot, something coming from a gland is produced to cool the body.

Ex Output:
glands


Ex Input:
Sentence1: Energy enters ecosystems in the form of sunlight or chemical compounds. 
Sentence2: Sunlight is composed of photons, or particles of solar energy.

Ex Output:

sunlight