input: Write a python function to count the number of vowels, consonants, and digits in a given string and return a tuple of the form (vowels, consonants, digits).
  assert count_vowels_consonants_digits("Hello World 123") == (3, 7, 3)
  assert count_vowels_consonants_digits("Python 3.8") == (1, 5, 2)
  assert count_vowels_consonants_digits("AI 2021") == (2, 0, 4)
output: def count_vowels_consonants_digits(s):
      vowels = "aeiouAEIOU"
      digits = "0123456789"
      vowel_count = 0
      consonant_count = 0
      digit_count = 0
  
      for char in s:
          if char in vowels:
              vowel_count += 1
          elif char in digits:
              digit_count += 1
          elif char.isalpha():
              consonant_count += 1
  
      return (vowel_count, consonant_count, digit_count)