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: 'two large boats were in the water with some cows grazing in the foreground'. Remove all words of length '7' in the given sentence.

two large boats were in the water with some cows in the foreground