Given the task definition and input, reply with output. In this task, you're given a short story of five sentences written in natural language. However, the order of the given story is not correct. Your job is to return the correct order for the given five sentences to create a coherent short story with the new order that has the correct flow. Generate your answer using the number of sentences in the correct order, such as '23415'.

Sentence1: Tim was thrilled. Sentence2: He studied hard and asked for extra credit. Sentence3: On the last day of school he found out he passed! Sentence4: He knew if he didn't pass he would have to go to summer school. Sentence5: Tim was failing math class.

53421