input: Write a function to check if the given string contains the word "Hello". Return True if it does, otherwise return False. If the input 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