Task: Sentence Ordering
Input (English): Sentence1: He arrives late and hasn't had time to eat dinner. Sentence2: Peter's friends invite him for a small Halloween party. Sentence3: Peter was happy his friend gave him food. Sentence4: The pie is delicious and it has whipped cream on the side. Sentence5: A friend offers him a slice of pumpkin pie at the party.
Output (English): 21543