Reverse a String of Letters

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Your question is Reverse a String of Letters. Start with the requirements on the right.

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Problem

Mercury Insurance systems may need to reverse short text values for validation or display utilities. Given a string containing letters, return a new string with the characters in reverse order.

Formal Specification

Implement reverse_letters(s), where s is a string containing zero or more English alphabetic characters. Return a string containing the same characters in reverse order. Preserve each character exactly, including its case. The input string must not be modified, which is naturally satisfied because Python strings are immutable.

Constraints

0 <= len(s) <= 10^5
s contains only English alphabetic characters
The input may be empty
The output contains the same characters in reverse order

Function Signature

def reverse_letters(s):

Your solutionPython 3

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