input: Write a python function to tokenize a sentence into words and numbers.
  assert tokenize('The quick brown fox jumped over the lazy dog.') == ['The', 'quick', 'brown', 'fox', 'jumped', 'over', 'the', 'lazy', 'dog']
  assert tokenize('Hello, World! 123') == ['Hello', 'World', '123']
  assert tokenize('Python3.9 is great') == ['Python', '3', '9', 'is', 'great']
  assert tokenize('No numbers here!') == ['No', 'numbers', 'here']
output: def tokenize(sentence):
      import re
      return re.findall(r'\b\w+\b', sentence)