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 jelly filled doughnut being held up to show what kind of jelly is on the inside'. Remove all words of length '5' in the given sentence.
a filled doughnut held up to show what kind of is on the inside