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_51737 ( "Rank" real, "Constituency" text, "Winning party 2003" text, "Swing to gain" real, "Labour's place 2003" text, "Result" text )

### Question ###
Can you tell me the sum of Swing to gain that has Constituency of caithness, sutherland and easter ross?

### Accurate SQL ###

SELECT SUM("Swing to gain") FROM table_51737 WHERE "Constituency" = 'caithness, sutherland and easter ross'