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.

Sentence: 'a man and woman standing with luggage in a waiting area'. Reverse all words of length '7' in the given sentence.
a man and woman standing with egaggul in a gnitiaw area

Sentence: 'two birds standing and sticking their heads in muddy water'. Reverse all words of length '3' in the given sentence.
owt birds standing dna sticking their heads in muddy water

Sentence: 'a man in shawl with bear on a cellphone'. Reverse all words of length '9' in the given sentence.

a man in shawl with bear on a enohpllec