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

### Instruction:
What are the smallest assets with a Company of piraeus bank, and a Revenue (US$ billion) smaller than 3.9?

### Inputs:
table_name: table, columns: ['Rank', 'Company', 'Revenues (US$ billion)', 'Profit (US$ billion)', 'Assets (US$ billion)', 'Market value (US$ billion)']

### Response:
SELECT MIN Assets (US$ billion) FROM table WHERE Company = piraeus bank AND Revenues (US$ billion) < 3.9