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