Which season last aired on May 6, 1987?
CREATE TABLE table_33828 (
    "Season" text,
    "Episodes" real,
    "First airdate" text,
    "Last airdate" text,
    "Nielsen ranking" text
)
SELECT "Season" FROM table_33828 WHERE "Last airdate" = 'may 6, 1987'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: Which season last aired on May 6, 1987? ### Input: CREATE TABLE table_33828 (
    "Season" text,
    "Episodes" real,
    "First airdate" text,
    "Last airdate" text,
    "Nielsen ranking" text
) ### Response: SELECT "Season" FROM table_33828 WHERE "Last airdate" = 'may 6, 1987'