input: Write a python function to search for an item in a list and return its index, or -1 if not found.
  assert search([1, 5, 4, 6, 9, 10], 6) == 3
  assert search([1, 5, 4, 6, 9, 10], 9) == 4
  assert search([1, 5, 4, 6, 9, 10], 11) == -1
output: def search(lst, item):
      try:
          return lst.index(item)
      except ValueError:
          return -1