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 man outside with a teddy bear sitting in front of him on a chair the teddy bear is watching tv in while in the desert'. Remove all words of length '8' in the given sentence.
a man outside with a teddy bear sitting in front of him on a chair the teddy bear is tv in while in the desert