What is the correct grammar and punctuation in the following sentence?
I'm going to the store after school.

Note: The only change that needs to be made is the addition of a period at the end of the sentence.
I'm going to the store after school
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.

### Instruction:
What is the correct grammar and punctuation in the following sentence?

### Input:
I'm going to the store after school

### Response:
I'm going to the store after school.

Note: The only change that needs to be made is the addition of a period at the end of the sentence.