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.

Sentence: 'a young lady is holding on to a street sign and smiling'. Remove all words of length '3' in the given sentence.
a young lady is holding on to a street sign smiling

Sentence: 'two birds sitting on a large rock next to a river'. Remove all words of length '5' in the given sentence.
two sitting on a rock next to a

Sentence: 'a dog that is looking at a can of food'. Remove all words of length '7' in the given sentence.

a dog that is at a can of food