In this task, you need to reverse 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.
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Question: Sentence: 'a yellow bird that is on a branch'. Reverse all words of length '1' in the given sentence.

Answer: a yellow bird that is on a branch


Question: Sentence: 'looking down at skiers holding their skis on the ski slope'. Reverse all words of length '7' in the given sentence.

Answer: gnikool down at skiers gnidloh their skis on the ski slope


Question: Sentence: 'a couple of giraffes sit down next to some palm trees'. Reverse all words of length '8' in the given sentence.

Answer:
a couple of seffarig sit down next to some palm trees