input: Write a function to return True if the given string contains the word "Hello", otherwise 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("Say Hello")==True
  assert check_hello("Well, hello")==True
  assert check_hello("")==False
output: def check_hello(s):
      return 'Hello' in s