input: Write a function to determine if a given string contains the word "Hello". The function should return True if the string contains "Hello", otherwise it should return False.
  assert check_hello("Hello World")==True
  assert check_hello("Hi there, how are you?")==False
  assert check_hello("Welcome to Hello Music")==True
  assert check_hello("")==False
  assert check_hello("Hello")==True
output: def check_hello(s):
      return "Hello" in s