Task: Sentence Ordering
Input (English): Sentence1: They gave him a flea medication and it cleared up. Sentence2: Alex suspected that his cat Tigger might have fleas. Sentence3: The veterinarian confirmed that Tigger did indeed have fleas. Sentence4: Alex took Tigger to the veterinarian to be diagnosed. Sentence5: Tigger was constantly scratching himself day and night.
Output (English): 51432