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

### Instruction:
What's the call sign that has 20kw of power?

### Inputs:
table_name: table, columns: ['Branding', 'Call-Sign', 'Frequency', 'Power (kw)', 'Location']

### Response:
SELECT Call-Sign FROM table WHERE Power (kw) = 20kw