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 ENROLLED_IN (StuID VARCHAR, Grade VARCHAR)
### Question:
Find the number of students that have at least one grade "B".
### Answer:
SELECT COUNT(DISTINCT StuID) FROM ENROLLED_IN WHERE Grade = "B"