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 field of green grass that has five surfboard positioned in a half circle together'. Remove all words of length '9' in the given sentence.
a field of green grass that has five positioned in a half circle together

Sentence: 'six people with a dog in the snow'. Remove all words of length '6' in the given sentence.
six with a dog in the snow

Sentence: 'a tennis player readies himself for the ball'. Remove all words of length '4' in the given sentence.

a tennis player readies himself for the