744. Find Smallest Letter Greater Than Target

https://leetcode.com/problems/find-smallest-letter-greater-than-target/

Python

class Solution:
    def nextGreatestLetter(self, letters: List[str], target: str) -> str:
        target_ord = ord(target)

        for letter in letters:
            if ord(letter) > target_ord:
                return letter
        return letters[0]