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 problems (problem_id VARCHAR, date_problem_reported INTEGER)
### Question:
What are the ids of the problems which are reported before 1978-06-26?
### Answer:
SELECT problem_id FROM problems WHERE date_problem_reported < "1978-06-26"