Task: Sentence Ordering
Input (English): Sentence1: The Smith's could not find their cat. Sentence2: They were afraid she had gotten outside and gotten lost. Sentence3: The Smiths all cheered, and rushed to hug their cat. Sentence4: Then they noticed her looking down at them from the top branches. Sentence5: Everyone was sad when they sat down in front of the Christmas tree.
Output (English): 12543