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.

Sentence: 'a furry black dog licks is lips in the snow next to a yellow fire hydrant'. Remove all words of length '6' in the given sentence.
a furry black dog licks is lips in the snow next to a fire hydrant