A substring is a contiguous (non-empty) sequence of characters within a string.

A vowel substring is a substring that only consists of vowels (`'a'`, `'e'`, `'i'`, `'o'`, and `'u'`) and has all five vowels present in it.

Given a string `word`, return the number of vowel substrings in `word`.

Example 1:

    Input: word = "aeiouu"
    Output: 2
    Explanation: The vowel substrings of word are as follows (underlined):
    - "aeiouu"
    - "aeiouu"

Example 2:

    Input: word = "unicornarihan"
    Output: 0
    Explanation: Not all 5 vowels are present, so there are no vowel substrings.

Example 3:

    Input: word = "cuaieuouac"
    Output: 7
    Explanation: The vowel substrings of word are as follows (underlined):
    - "cuaieuouac"
    - "cuaieuouac"
    - "cuaieuouac"
    - "cuaieuouac"
    - "cuaieuouac"
    - "cuaieuouac"
    - "cuaieuouac"

Constraints:

- `1 <= word.length <= 100`
- `word` consists of lowercase English letters only.