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 grey cat with green eyes looking straight ahead'. Reverse all words of length '1' in the given sentence.

SOLUTION: a grey cat with green eyes looking straight ahead

PROBLEM: Sentence: 'a fire hydrant placed in the street just off the curb'. Reverse all words of length '3' in the given sentence.

SOLUTION: a fire hydrant placed in eht street just ffo eht curb

PROBLEM: Sentence: 'a person cross country skiing on a sunny day'. Reverse all words of length '7' in the given sentence.

SOLUTION:
a person cross yrtnuoc skiing on a sunny day