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 man with a backpack waiting at a train station'. Remove all words of length '7' in the given sentence.
Example Output: a man with a backpack at a train

Example Input: Sentence: 'a large group of people with some tennis rackets'. Remove all words of length '4' in the given sentence.
Example Output: a large group of people tennis rackets

Example Input: Sentence: 'a couple of young women standing next to each other'. Remove all words of length '1' in the given sentence.
Example Output:
couple of young women standing next to each other