import sys
from xml.etree import cElementTree as etree

input_file = sys.stdin
context = iter(etree.iterparse(input_file, events=('start', 'end')))
_, root = next(context) # get root element
for event, elem in context:
    if event == 'end' and elem.tag == 'build_location':
       print(elem.text)
       root.clear() # free memory