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

### Instruction:
Which Wins have a Year of 1963, and a Class of 50cc?

### Inputs:
table_name: table, columns: ['Year', 'Class', 'Team', 'Points', 'Wins']

### Response:
SELECT AVG Wins FROM table WHERE Year = 1963 AND Class = 50cc