How many times has Ma Long won the men's singles?
CREATE TABLE table_28138035_33 (
    mens_doubles VARCHAR,
    mens_singles VARCHAR
)
SELECT COUNT(mens_doubles) FROM table_28138035_33 WHERE mens_singles = "Ma Long"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: How many times has Ma Long won the men's singles? ### Input: CREATE TABLE table_28138035_33 (
    mens_doubles VARCHAR,
    mens_singles VARCHAR
) ### Response: SELECT COUNT(mens_doubles) FROM table_28138035_33 WHERE mens_singles = "Ma Long"