Do numbers or letters go first in alphabetical order?

Related questions

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5. Which sentence has all 26 letters?
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7. What is the shortest word with all 5 vowels in it?
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Tags

1. #compared
2. #determine
3. #types
4. #arranging
5. #letters
6. #characters
7. #order
8. #sequences
9. #first
10. #digits
11. #which
12. #strings
13. #lexicographical
14. #their
15. #alphabetical
16. #mathematics
17. #numbers
18. #other
19. #generalization
20. #comes