What is the average number for the song 'O Sudha'?
CREATE TABLE table_66366 (
    "Number" real,
    "Song Title" text,
    "Lyricist" text,
    "Singer(s)" text,
    "Length" text
)
SELECT AVG("Number") FROM table_66366 WHERE "Song Title" = 'o sudha'
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 average number for the song 'O Sudha'? ### Input: CREATE TABLE table_66366 (
    "Number" real,
    "Song Title" text,
    "Lyricist" text,
    "Singer(s)" text,
    "Length" text
) ### Response: SELECT AVG("Number") FROM table_66366 WHERE "Song Title" = 'o sudha'