You will be given a definition of a task first, then some input of the task.
In this task, you will be presented with a question and you have to answer the question based on your knowledge. Your answers should be as short as possible.

What athlete competed in the event where preliminaries started at 14:48 , quarterfinals started at 16:10 , semifinals at 19:02 and the final at 20:09 ?
Output:
Seo Byeong-deok