import hashlib
import random
import struct
import sys
import zlib
def part1():
    return list(hashlib.md5(teamname).hexdigest()[:8])
def part2(name):
    random.seed(name)
    chrset = '0123456789abcdef'
    return [chrset[random.randint(0, 15)] for x in xrange(8)][::-1]
def part3():
    name = (teamname + 'w00p')[:4].encode('hex')
    for x in xrange(4):
        data[x] = name[x*2:x*2+2]
def part4():
    crc = struct.pack('I', zlib.crc32('tulband') & 0xffffffff).encode('hex')
    for x in xrange(4):
        if flag[16+x*4+1] != crc[x] or flag[16+x*4+2] != crc[x+1]:
            return False
    return True
if __name__ == '__main__':
    if len(sys.argv) != 3:
        print 'Usage: python %s <teamname> <flag>' % sys.argv[0]
        exit(0)
    if len(sys.argv[2]) != 32:
        print 'Incorrect Key Length'
        exit(0)
    teamname = sys.argv[1]
    flag = sys.argv[2]
    data = {}
    part3()
    if part1() == [flag[x*4] for x in xrange(8)] and \
            part2(teamname) == [flag[x*4+3] for x in xrange(8)][::-1] and \
            data == dict((x, flag[x*4+1:x*4+3]) for x in xrange(4)) and \
            part4():
        print '[x] Correct Flag'
        print '[+] Now submit it'
    else:
        print '[-] Incorrect Flag'