CREATE TABLE table_name_48 (swing_to_gain INT, constituency VARCHAR)

Can you tell me the sum of Swing to gain that has Constituency of caithness, sutherland and easter ross?
SELECT SUM(swing_to_gain) FROM table_name_48 WHERE constituency = "caithness, sutherland and easter ross"
SELECT SUM("swing_to_gain") FROM "table_name_48" WHERE "caithness, sutherland and easter ross" = "constituency"