Task: Sentence Ordering
Input (English): Sentence1: The bite was red and itchy, but it didn't bother him at first. Sentence2: Ivan got bitten by a mosquito on a forest hike. Sentence3: Then it swelled up terribly and became sore. Sentence4: A doctor looked at it and told Ivan the bite was infected! Sentence5: Ivan bought mosquito repellent for his next hike.
Output (English): 21345