Classify whether the following sentence contains an example of assonance, consonance or alliteration.
She sells seashells by the seashore.
This sentence contains an example of alliteration.
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Classify whether the following sentence contains an example of assonance, consonance or alliteration.

### Response:
This sentence contains an example of alliteration.