What is the smallest fleet size with a type of shunter introduced in 1953?
CREATE TABLE table_57527 (
    "Class" text,
    "Type" text,
    "Introduced" text,
    "Fleet Size" real,
    "Numbers" text
)
SELECT MIN("Fleet Size") FROM table_57527 WHERE "Type" = 'shunter' AND "Introduced" = '1953'
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 smallest fleet size with a type of shunter introduced in 1953? ### Input: CREATE TABLE table_57527 (
    "Class" text,
    "Type" text,
    "Introduced" text,
    "Fleet Size" real,
    "Numbers" text
) ### Response: SELECT MIN("Fleet Size") FROM table_57527 WHERE "Type" = 'shunter' AND "Introduced" = '1953'