In this task, you are given a sentence. You are expected to recognize the name of gene or protein. Although there might be several correct answers, you need to write one of them.

Ex Input:
Differential gene expression in ERα-positive and ERα-negative breast cancer cells upon leptin stimulation.

Ex Output:
leptin


Ex Input:
Hexahydrochromeno[4,3-b]pyrrole derivatives as acetylcholinesterase inhibitors.

Ex Output:
acetylcholinesterase


Ex Input:
4-Hydroxypyridazin-3(2H)-one Derivatives as Novel d-Amino Acid Oxidase Inhibitors.

Ex Output:

d-Amino Acid Oxidase