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: Endospores are commonly found in soil and water. 
Sentence2: Some bacteria form resistant cells called endospores.

Output: Endospores


Input: Consider Input: Sentence1: Electrical currents cause magnetic fields. 
Sentence2: Electrical currents can cause objects to repel each other.

Output: Electrical


Input: Consider Input: Sentence1: Urine is the liquid waste product of the body that is excreted by the urinary system. 
Sentence2: minerals are excreted through the urinary system.


Output: system