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_1341690_18 (incumbent VARCHAR, result VARCHAR)
### Question:
How many incumbents resulted in a lost renomination republican gain?
### Answer:
SELECT COUNT(incumbent) FROM table_1341690_18 WHERE result = "Lost renomination Republican gain"