When the blank ends at 1, what is the PA?
CREATE TABLE table_21225 (
    "Province" text,
    "Skip" text,
    "W" real,
    "L" real,
    "PF" real,
    "PA" real,
    "Ends Won" real,
    "Ends Lost" real,
    "Blank Ends" real,
    "Stolen Ends" real,
    "Shot Pct." real
)
SELECT COUNT("PA") FROM table_21225 WHERE "Blank Ends" = '1'
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: When the blank ends at 1, what is the PA? ### Input: CREATE TABLE table_21225 (
    "Province" text,
    "Skip" text,
    "W" real,
    "L" real,
    "PF" real,
    "PA" real,
    "Ends Won" real,
    "Ends Lost" real,
    "Blank Ends" real,
    "Stolen Ends" real,
    "Shot Pct." real
) ### Response: SELECT COUNT("PA") FROM table_21225 WHERE "Blank Ends" = '1'