512. Alternating Vowel Consonant Count

Given a string s consisting of lowercase English letters, return the number of times a vowel is immediately followed by a consonant.

Vowels are 'a', 'e', 'i', 'o', 'u'.

Example:
Input: s = "abacus"
Output: 3
Explanation: 'a' is followed by 'b', 'a' is followed by 'c', and 'u' is followed by 's'.

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