Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_50 (year INTEGER, genre VARCHAR)
### Question:
What is total number of years that has genre of first-person shooter?
### Answer:
SELECT SUM(year) FROM table_name_50 WHERE genre = "first-person shooter"