user: Question: What position does the player from Malvern Prep play?
Columns: ['Year', 'Player', 'Position', 'High School', 'Hometown', 'MLB Draft']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1989.0, 'Tyler Houston', 'Catcher', 'Valley High School', 'Las Vegas, NV', '1st Round - 2nd pick of 1989 Draft ( Braves )']
SQL:

assistant: SELECT "Position" FROM "Table" WHERE "High School" = 'Malvern Prep';