input: Write a function to check if the 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("Hi there!")==False
  assert check_hello("This is a Hello message.")==True
  assert check_hello("")==False
  assert check_hello("hello")==False
output: def check_hello(s):
      return 'Hello' in s