Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the mean pick when the play is Marc Lewis (lhp) and the round is less than 20?

### Inputs:
table_name: table, columns: ['Round', 'Pick', 'Player', 'Nationality', 'School']

### Response:
SELECT AVG Pick FROM table WHERE Player = marc lewis (lhp) AND Round < 20