Given a list of unique strings, find the longest string
['thirty-nine', 'forty-one', 'five', 'seventeen']
The longest string in the given list is "thirty-nine".
Complete the following task based on the instruction and optional input provided.### Instruction:
Given a list of unique strings, find the longest string

### Input:
['thirty-nine', 'forty-one', 'five', 'seventeen']

### Output:
The longest string in the given list is "thirty-nine".