how many times is the constituency edinburgh northern and leith?
CREATE TABLE table_77807 (
    "Rank" real,
    "Constituency" text,
    "Winning party 2007" text,
    "Swing to gain" real,
    "LD's place 2007" text,
    "Result" text
)
SELECT COUNT("Swing to gain") FROM table_77807 WHERE "Constituency" = 'edinburgh northern and leith'
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 is the constituency edinburgh northern and leith? ### Input: CREATE TABLE table_77807 (
    "Rank" real,
    "Constituency" text,
    "Winning party 2007" text,
    "Swing to gain" real,
    "LD's place 2007" text,
    "Result" text
) ### Response: SELECT COUNT("Swing to gain") FROM table_77807 WHERE "Constituency" = 'edinburgh northern and leith'