input: Write a function to verify if every element in a tuple has the identical data type.
  assert check_elements_type((5, 6, 7, 3, 5, 6) ) == True
  assert check_elements_type((1, 2, "4") ) == False
  assert check_elements_type((3, 2, 1, 4, 5) ) == True
output: def check_elements_type(tup):
      if not tup:
          return True
      first_type = type(tup[0])
      return all(type(el) == first_type for el in tup)