input: def linearSearch(search_item, array):
      """ Function to perform linear search on a given array.
      If the item is found in the array, it will return the position of the item.
      If the item is not found in the array, it will return -1.
      >>> linearSearch('hospital', ['school', 'hospital', 'bookstore', 'mall', 'theatre'])
      1
      >>> linearSearch('park', ['school', 'hospital', 'bookstore', 'mall', 'theatre'])
      -1
      """
      for i in range(len(array)):
          if array[i] == search_item:
              return i
      return -1
output:     for i in range(len(array)):
          if array[i] == search_item:
              return i
      return -1