Task: Sentence Ordering
Input (English): Sentence1: She walked him around but still he did not sleep. Sentence2: The mother gently sung the lullaby to her baby. Sentence3: Once there was a mother who was desperate for her baby to sleep. Sentence4: She fed him but still he did not sleep. Sentence5: Finally, she remembered the lullaby her mother had sung to her.
Output (English): 25134