Task: Sentence Ordering
Input (English): Sentence1: Iva and Brant were trying to conceive a child. Sentence2: They had been trying for six months with no success. Sentence3: The couple will be happy to know they have a baby on the way. Sentence4: But then they saw the doctor smiling broadly. Sentence5: At their doctor's appointment, they expressed discouragement.
Output (English): 12543