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_94 (gross_tonnage INTEGER, ship VARCHAR, date_commissioned VARCHAR)
### Question:
Tell me the sum of Gross Tonnage for isis ship on date commisioned less than 1842
### Answer:
SELECT SUM(gross_tonnage) FROM table_name_94 WHERE ship = "isis" AND date_commissioned < 1842