A decimal number is called deci-binary if each of its digits is either `0` or `1` without any leading zeros. For example, `101` and `1100` are deci-binary, while `112` and `3001` are not.

Given a string `n` that represents a positive decimal integer, return the minimum number of positive deci-binary numbers needed so that they sum up to `n`.

Example 1:

    Input: n = "32"
    Output: 3
    Explanation: 10 + 11 + 11 = 32

Example 2:

    Input: n = "82734"
    Output: 8

Example 3:

    Input: n = "27346209830709182346"
    Output: 9

Constraints:

- `1 <= n.length <= 105`
- `n` consists of only digits.
- `n` does not contain any leading zeros and represents a positive integer.