What is the Pinyin for the item that has a density of 77?
CREATE TABLE table_35850 (
    "Name" text,
    "Hanzi" text,
    "Hanyu Pinyin" text,
    "Population (2010-11-01)" text,
    "Area (km\u00b2)" text,
    "Density (/km\u00b2)" text
)
SELECT "Hanyu Pinyin" FROM table_35850 WHERE "Density (/km\u00b2)" = '77'
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: What is the Pinyin for the item that has a density of 77? ### Input: CREATE TABLE table_35850 (
    "Name" text,
    "Hanzi" text,
    "Hanyu Pinyin" text,
    "Population (2010-11-01)" text,
    "Area (km\u00b2)" text,
    "Density (/km\u00b2)" text
) ### Response: SELECT "Hanyu Pinyin" FROM table_35850 WHERE "Density (/km\u00b2)" = '77'