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: 'the  varieties of pizzas  are displayed in the shop window on a city street crowded with pedestrians'. Remove all words of length '7' in the given sentence.

the varieties of pizzas are displayed in the shop window on a city street with pedestrians