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.

Example Input: Sentence: 'a mountain towers over a train going down the tracks'. Remove all words of length '4' in the given sentence.
Example Output: a mountain towers a train going the tracks

Example Input: Sentence: 'a man jumping in the air with something in his hand'. Remove all words of length '9' in the given sentence.
Example Output: a man jumping in the air with in his hand

Example Input: Sentence: 'a small child on a skate board out doors'. Remove all words of length '5' in the given sentence.
Example Output:
a on a out