Categorize the input news's emotional tone into one of three groups.
Options: negative, positive

Affirm CFO Michael Linford joins Yahoo Finance Live to discuss the buy now, pay later company's outlook amid stock volatility. Pfizer CEO Dr. Albert Bourla joins Yahoo Finance Live to discuss global COVID-19 vaccine distribution, research, vaccine development for current and future variants, and maintaining business in Russia as the Russia-Ukraine war continues.
positive