<|im_start|>user
From the passage provided, extract the names of the writers for the movie Captain America: The First Avenger. Separate them with a comma.

Context:
Captain America: The First Avenger is a 2011 American superhero film based on the Marvel Comics character Captain America. Produced by Marvel Studios and distributed by Paramount Pictures, it is the fifth film in the Marvel Cinematic Universe (MCU). The film was directed by Joe Johnston, written by Christopher Markus and Stephen McFeely, and stars Chris Evans as Steve Rogers / Captain America alongside Tommy Lee Jones, Hugo Weaving, Hayley Atwell, Sebastian Stan, Dominic Cooper, Toby Jones, Neal McDonough, Derek Luke, and Stanley Tucci. During World War II, Steve Rogers, a frail man, is transformed into the super-soldier Captain America and must stop the Red Skull (Weaving) from using the Tesseract as an energy source for world domination.<|im_end|>
<|im_start|>assistant
Christopher Markus, Stephen McFeely<|im_end|>
