Joe's Adventure/1/1/1/2/1/2/1/1

Aaah! Buttons everywhere! You glance upwards to see a screen, with a popup screen, reading:

"Enter Passcode"

You see four spaces, so you inquire that there's four password characters.

What do you enter?

1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
7. 7
8. 8
9. 9
10. A
11. B
12. C
13. D
14. E
15. F
16. G
17. H
18. I
19. J
20. K
21. L
22. M
23. N
24. O
25. P
26. Q
27. R
28. S
29. T
30. U
31. V
32. W
33. X
34. Y
35. Z

Or...

1. Leave?