Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_18343 ( "District" text, "Incumbent" text, "Party" text, "First elected" real, "Result" text, "Candidates" text )

### Question ###
How many incumbents resulted in a lost renomination republican gain?

### Accurate SQL ###

SELECT COUNT("Incumbent") FROM table_18343 WHERE "Result" = 'Lost renomination Republican gain'