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

### Instruction:
Who was the runner up when the won by 4 strokes?

### Inputs:
table_name: table, columns: ['No.', 'Date', 'Tournament', 'Winning score', 'To par', 'Margin of victory', 'Runner(s)-up']

### Response:
SELECT Runner(s)-up FROM table WHERE Margin of victory = 4 strokes