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 table_name_18 (masculine_u_stems VARCHAR, neuter_a_stems VARCHAR, masculine_a_stems VARCHAR)
### Question:
What is the u form of the word with a neuter form of skip and a masculine a-ending of fisker?
### Answer:
SELECT masculine_u_stems FROM table_name_18 WHERE neuter_a_stems = "skip" AND masculine_a_stems = "fisker"