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: 'a picture of three horses grazing in front of some buildings in pinned field'. Remove all words of length '1' in the given sentence.

picture of three horses grazing in front of some buildings in pinned field