Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE TRANSACTIONS (amount_of_transaction INTEGER, transaction_type_code VARCHAR, share_count VARCHAR)
### Question:
Show the minimum amount of transactions whose type code is "PUR" and whose share count is bigger than 50.
### Answer:
SELECT MIN(amount_of_transaction) FROM TRANSACTIONS WHERE transaction_type_code = "PUR" AND share_count > 50