In this task, you need to remove 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 bird perched on a wood rail by itself'. Remove all words of length '7' in the given sentence.
a bird on a wood rail by itself

Sentence: 'a cat laying on a desk in front of a computer'. Remove all words of length '1' in the given sentence.
cat laying on desk in front of computer

Sentence: 'a man riding a skateboard down a walkway'. Remove all words of length '7' in the given sentence.

a man riding a skateboard down a