input: Write a Python function to determine whether all items in a tuple share the same data type.
  
  assert check_equal_type((5, 6, 7, 3, 5, 6)) == True
  assert check_equal_type((1, 2, "4")) == False
  assert check_equal_type((3, 2, 1, 4, 5)) == True
output: def check_equal_type(tup):
      return all(isinstance(item, type(tup[0])) for item in tup)