Of the players whose lead began at the australian championships, what was the shortest span of years led?
CREATE TABLE table_26047 (
    "Years led" text,
    "Span of years led" real,
    "Player" text,
    "Titles won at point of lead" real,
    "Total Career titles" real,
    "Tournament at which lead began" text
)
SELECT MIN("Span of years led") FROM table_26047 WHERE "Tournament at which lead began" = 'Australian Championships'
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: Of the players whose lead began at the australian championships, what was the shortest span of years led? ### Input: CREATE TABLE table_26047 (
    "Years led" text,
    "Span of years led" real,
    "Player" text,
    "Titles won at point of lead" real,
    "Total Career titles" real,
    "Tournament at which lead began" text
) ### Response: SELECT MIN("Span of years led") FROM table_26047 WHERE "Tournament at which lead began" = 'Australian Championships'