Whats the number of times the letter , appears in:
Marcus Sakey is the author of five novels, most recently THE TWO DEATHS OF DANIEL HAYES. Before becoming a full time novelist, he worked for ten years in television and advertising, which he jokes gave him the perfect experience to write about thieves and killers. Marcus has shadowed homicide detectives, toured the morgue, gone shooting with Special Forces soldiers, ridden with gang cops, and learned to pick a deadbolt. He swears it was all for research.Visit MarcusSakey.com and follow him on Twitter @MarcusSakey.

user
The total number of ","s in that passage is seven.
assistant