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: Carbon dioxide is controlled by the carbon cycle. 
Sentence2: Carbon dioxide is controled by the carbon circle and is transferred between organisms and atmosphere.

Output: controlled


Input: Consider Input: Sentence1: Plants exhibit phototropism, or growing toward a light source. 
Sentence2: Bamboos are vigorous, rugged plants.

Output: Plants


Input: Consider Input: Sentence1: thirst is used to make an animal realize that it needs to replenish its bodily water by the body. 
Sentence2: thirst is used to make chickens realize they need to replenish its bodily water.


Output: bodily