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: 'an old fashioned clock on a pedestal for first national bank and trust company'. Remove all words of length '9' in the given sentence.
Example Output: an old clock on a pedestal for first national bank and trust company

Example Input: Sentence: 'the three giraffes are standing on the grassland'. Remove all words of length '2' in the given sentence.
Example Output: the three giraffes are standing the grassland

Example Input: Sentence: 'a dont walk sign is hanging underneath a street named mermaid'. Remove all words of length '5' in the given sentence.
Example Output:
a dont walk sign is hanging underneath a street mermaid