input: Write a function to eliminate all tuples of length k.
  assert remove_tuples([(4, 5), (4, ), (8, 6, 7), (1, ), (3, 4, 6, 7)] , 1) == [(4, 5), (8, 6, 7), (3, 4, 6, 7)]
  assert remove_tuples([(4, 5), (4,5), (6, 7), (1, 2, 3), (3, 4, 6, 7)] ,2) == [(1, 2, 3), (3, 4, 6, 7)]
  assert remove_tuples([(1, 4, 4), (4, 3), (8, 6, 7), (1, ), (3, 6, 7)] , 3) == [(4, 3), (1,)]
output: def remove_tuples(lst, k):
      return [t for t in lst if len(t) != k]