input: from typing import List
  
  def linearSearch(search_item: str, array: List[str]) -> int:
      """ Performs a linear search on the given array to find the position of the search_item.
      Returns the position if found, otherwise returns -1.
      >>> linearSearch('hospital', ['school', 'hospital', 'bookstore', 'mall', 'theatre'])
      1
      >>> linearSearch('zoo', ['school', 'hospital', 'bookstore', 'mall', 'theatre'])
      -1
      """
output:     for i in range(len(array)):
          if array[i] == search_item:
              return i
      return -1