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