In this task, you're given a pair of sentences, sentence 1 and sentence 2. Your job is to write a single word that describes the genre that the two sentences belong to, such as face-to-face, government, letters, 9/11, slate, telephone, travel, verbatim, oup, fiction.

Example Input: Sentence 1: and Management of Scientific Studies in Natural Sentence 2: Natural science 
Example Output: government

Example Input: Sentence 1: The future's bright. Sentence 2: I am optimistic about life.
Example Output: slate

Example Input: Sentence 1: SO2 and NOx emissions from power generation react in the atmosphere to form nitrates and sulfates, which are a substantial fraction of fine particle (PM2. Sentence 2: PM2 particles spontaneously form from water vapor and x-rays.
Example Output:
government