Write a Python function that counts the number of vowels and consonants in a given string, ensuring to handle edge cases such as empty strings or strings with special characters. Treat uppercase and lowercase English letters equivalently. Ignore digits, whitespace, punctuation, and symbols, and return a tuple (vowel_count, consonant_count). Use the signature def count_vowels_consonants(s):.
A-Z and a-z are classified(vowel_count, consonant_count)def count_vowels_consonants(s):