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

### Instruction:
What is the number of colour with the regisration number of mg-509?

### Inputs:
table_name: table, columns: ['Pilot car No.', 'Colour', 'Serial No.', 'Engine No.', 'Registration No.']

### Response:
SELECT COUNT Colour FROM table WHERE Registration No. = MG-509