Definition: 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.
Input: Sentence: 'one man looking frightened leaning on an umbrella while the other man is smiling'. Remove all words of length '2' in the given sentence.

one man looking frightened leaning umbrella while the other man smiling