What was the transfer fee when winter was the transfer window?
CREATE TABLE table_44674 (
    "Nat." text,
    "Name" text,
    "Moving to" text,
    "Type" text,
    "Transfer window" text,
    "Transfer fee" text,
    "Source" text
)
SELECT "Transfer fee" FROM table_44674 WHERE "Transfer window" = 'winter'
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 was the transfer fee when winter was the transfer window? ### Input: CREATE TABLE table_44674 (
    "Nat." text,
    "Name" text,
    "Moving to" text,
    "Type" text,
    "Transfer window" text,
    "Transfer fee" text,
    "Source" text
) ### Response: SELECT "Transfer fee" FROM table_44674 WHERE "Transfer window" = 'winter'