Need help counting the unique digits ina list of numbers

Here is an example.
What forumula would I use?
1's 2's 3's 4's 5's 6's 7's 8's 9's 0's
List 6 2 2 2 2 0 0 0 0 1 Number of digits
1
2
3
4
5
10
12
13
14
15