input: Write a python function to check if there are any duplicate elements in a list.
  assert is_duplicate([1, 2, 3, 4, 5]) == False
  assert is_duplicate([1, 2, 3, 4, 5, 5]) == True
  assert is_duplicate([1, 1, 1, 1, 1]) == True
  assert is_duplicate([10, 20, 30, 40, 50]) == False
output: def is_duplicate(lst):
      return len(lst) != len(set(lst))