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Problem 17: Selective Phoneme Inversion (Reverse Vowels of a String)

Problem Statement

Given a string s, reverse only all the vowels in the string and return it. The vowels are 'a', 'e', 'i', 'o', and 'u', and they can appear in both cases.

Input Format

  • A string s.

Example

Input: s = "hello"
Output: "holle" Input: s = "leetcode"
Output: "leotcede"

Vowels in "leetcode" are e, e, o, e. Reversing them: e, o, e, e.