What is the highest value of PF when Ends Lost is 51?
CREATE TABLE table_19828 (
    "Locale" 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." text
)
SELECT MAX("PF") FROM table_19828 WHERE "Ends Lost" = '51'
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: What is the highest value of PF when Ends Lost is 51? ### Input: CREATE TABLE table_19828 (
    "Locale" 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." text
) ### Response: SELECT MAX("PF") FROM table_19828 WHERE "Ends Lost" = '51'