Given a string input_text consisting of English letters (upper-case and lower-case), digits, and spaces, reverse the order of the words. Words are defined as sequences of non-space characters separated by spaces. The output string should contain the words in reverse order, separated by a single space, with no leading or trailing spaces and no multiple spaces between words.
Example 1
Input: openai is awesome
Output: awesome is openai
Explanation: Multiple spaces are reduced to single spaces, and words are reversed.
Example 2
Input: python programming language
Output: language programming python
Explanation: Leading and trailing spaces are removed, words are reversed.
Example 3
Input: 123 456 789
Output: 789 456 123
Explanation: Digits are treated as words and reversed.
Constraints
Case 1
Input: 'data science is fun'
Expected: 'fun is science data'
Case 2
Input: ' machine learning '
Expected: 'learning machine'
Case 3
Input: 'a b c d e'
Expected: 'e d c b a'
Case 4
Input: 'singleword'
Expected: 'singleword'
Case 5
Input: ' hello world python '
Expected: 'python world hello'