input: Write a function to check if a given string contains the word "Hello". If it does, return True; otherwise, return False.
  def check_hello(s):
      return 'Hello' in s
  assert check_hello("Hello, world!") == True
  assert check_hello("Goodbye!") == False
  assert check_hello("hello!") == False
  assert check_hello("Hello123") == True
  assert check_hello("") == False
output: def check_hello(s):
      return 'Hello' in s