Task: Sentence Ordering
Input (English): Sentence1: Rufus has just enrolled in a new school and he has no friends there. Sentence2: However, a nice guy named Ralph introduces himself to Rufus one day. Sentence3: They realize that they are in the same Chemistry class. Sentence4: At first he feels apprehensive and worried he won't meet anyone. Sentence5: They decide to be lab partners in their class together.
Output (English): 13425