Task: Sentence Ordering
Input (English): Sentence1: Suddenly, a few bats flew down from the darkness above. Sentence2: All the people but Lewis ran back towards the cave's entrance. Sentence3: Lewis knew the cave like the back of his hand. Sentence4: Lewis laughed and told them not be afraid of the bats. Sentence5: Five first-time cavers walked behind him.
Output (English): 34152