Task: Sentence Ordering
Input (English): Sentence1: Hal followed behind them with a moving van. Sentence2: Judy and the son arrived shortly before Hal. Sentence3: Hal and Judy were moving into a new home with their son. Sentence4: They spent the whole day packing everything up. Sentence5: When they were ready, Judy and the son travelled to the new home.
Output (English): 45123