How many position in channel 4s ratings a have February 24, 2010 as the original airing on channel 4?
CREATE TABLE table_24839 (
    "Episode number" real,
    "Title" text,
    "Original airing on Channel 4" text,
    "Time of airing on Channel 4" text,
    "Original airing on E4" text,
    "Time of airing on E4" text,
    "Position in Channel 4s ratings a" text,
    "Position in E4s ratings b" text,
    "Total viewers" text
)
SELECT COUNT("Position in Channel 4s ratings a") FROM table_24839 WHERE "Original airing on Channel 4" = 'February 24, 2010'
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 position in channel 4s ratings a have February 24, 2010 as the original airing on channel 4? ### Input: CREATE TABLE table_24839 (
    "Episode number" real,
    "Title" text,
    "Original airing on Channel 4" text,
    "Time of airing on Channel 4" text,
    "Original airing on E4" text,
    "Time of airing on E4" text,
    "Position in Channel 4s ratings a" text,
    "Position in E4s ratings b" text,
    "Total viewers" text
) ### Response: SELECT COUNT("Position in Channel 4s ratings a") FROM table_24839 WHERE "Original airing on Channel 4" = 'February 24, 2010'