What country is the player, with an undisclosed transfer fee and moving to Nacional, from?
CREATE TABLE table_55287 (
    "Name" text,
    "Country" text,
    "Status" text,
    "Moving to" text,
    "Transfer window" text,
    "Transfer fee" text
)
SELECT "Country" FROM table_55287 WHERE "Transfer fee" = 'undisclosed' AND "Moving to" = 'nacional'
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 country is the player, with an undisclosed transfer fee and moving to Nacional, from? ### Input: CREATE TABLE table_55287 (
    "Name" text,
    "Country" text,
    "Status" text,
    "Moving to" text,
    "Transfer window" text,
    "Transfer fee" text
) ### Response: SELECT "Country" FROM table_55287 WHERE "Transfer fee" = 'undisclosed' AND "Moving to" = 'nacional'