import xml.dom.minidom
import urllib, sys

def findrc(category):
    name = "http://www.rosettacode.org/w/api.php?action=query&list=categorymembers&cmtitle=Category:%s&cmlimit=500&format=xml" % urllib.quote(category)
    cmcontinue, titles = '', []
    while True:
        u = urllib.urlopen(name + cmcontinue)
        xmldata = u.read()
        u.close()
        x = xml.dom.minidom.parseString(xmldata)
        titles += [i.getAttribute("title") for i in x.getElementsByTagName("cm")]
        cmcontinue = filter( None,
                             (urllib.quote(i.getAttribute("cmcontinue"))
                              for i in x.getElementsByTagName("categorymembers")) )
        if cmcontinue:
            cmcontinue = '&cmcontinue=' + cmcontinue[0]
        else:
            break
    return titles

alltasks = findrc("Programming_Tasks")
lang = findrc(sys.argv[1])

for i in [i for i in alltasks if i not in lang]:
    print i