TASK DEFINITION: In this task, you need to reverse all words of a given length in the sentence. The number of letters in a word determine its length. For example, the length of the word "apple" is 5.
PROBLEM: Sentence: 'a group of people riding in a black raft'. Reverse all words of length '1' in the given sentence.

SOLUTION: a group of people riding in a black raft

PROBLEM: Sentence: 'a man sitting at a table and looking past the microphone'. Reverse all words of length '4' in the given sentence.

SOLUTION: a man sitting at a table and looking tsap the microphone

PROBLEM: Sentence: 'a train traveling down tracks next to a forest'. Reverse all words of length '1' in the given sentence.

SOLUTION:
a train traveling down tracks next to a forest