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

### Instruction:
Which Season has a Postseason of promoted runner-up?

### Inputs:
table_name: table, columns: ['Season', 'Tier', 'Division', 'Pos.', 'Postseason', 'Cup Competitions']

### Response:
SELECT Season FROM table WHERE Postseason = promoted runner-up