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 black cat curled up to a shoe on a rug'. Remove all words of length '2' in the given sentence.
Example Output: a black cat curled a shoe a rug

Example Input: Sentence: 'a european army helicopter flying in the sky'. Remove all words of length '8' in the given sentence.
Example Output: a army helicopter flying in the sky

Example Input: Sentence: 'two young men are playing a game on the wii'. Remove all words of length '4' in the given sentence.
Example Output:
two young men are playing a on the wii