Reverse Vowels in a String

You are given a string s. Your task is to reverse only the vowels in s while keeping all other characters in their original positions.

The vowels are defined as \(a, e, i, o, u\) in both lowercase and uppercase. For example, in the string "hello world", the vowels are e, o, o. After reversing the vowels, the string becomes "hollo werld".

Example:

Input:  hello world
Output: hollo werld

Use the standard input (stdin) to read the input string and output the answer via standard output (stdout).

inputFormat

The input consists of a single line containing the string s which may include spaces, punctuation, and both lowercase and uppercase letters.

outputFormat

Output the transformed string after reversing only the vowels while keeping the positions of the other characters unchanged.

hello world

hollo werld