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 ram that is standing on the grass'. Remove all words of length '1' in the given sentence.
Example Output: ram that is standing on the grass

Example Input: Sentence: 'a motorcycle covered with a red blanket is parked in the middle of a plaza'. Remove all words of length '3' in the given sentence.
Example Output: a motorcycle covered with a blanket is parked in middle of a plaza

Example Input: Sentence: 'a dirty train sits on the railroad track'. Remove all words of length '3' in the given sentence.
Example Output:
a dirty train sits on railroad track