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 brown bull with very long horns walking through a forest'. Remove all words of length '4' in the given sentence.
Example Output: a brown horns walking through a forest

Example Input: Sentence: 'a black and white picture of a train on the tracks'. Remove all words of length '6' in the given sentence.
Example Output: a black and white picture of a train on the

Example Input: Sentence: 'two farm animals are standing next to a white fence'. Remove all words of length '2' in the given sentence.
Example Output:
two farm animals are standing next a white fence