Having just seen
Artik's answer, I might have got it wrong.
An alternative to
Artik's:
- In cell E2 enter a 1
- In cell E3 enter a 2
- Select E2:E3 and autofill down
- Dropdown arrow in column E's header, choose Sort Largest to Smallest
- On the Data tab, Data Tools, choose Remove Duplicates
- In the dialogue box, have only a single tick against the Name column, click OK
- Dropdown arrow in column E's header, choose Sort Smallest to Largest
- Delete columns E and Day.