#!/usr/bin/python
import os, signal, struct, binascii
from sys import stdin, stdout

UI = lambda a : struct.unpack('I', a)[0]
PI = lambda a : struct.pack('I', a)

def crc32(data, salt) :
    return PI(binascii.crc32(salt + data) & 0xffffffff)

def main() :
    signal.alarm(25)

    salt = os.urandom(10)
    print 'salt:', salt.encode('hex')
    stdout.flush()

    n = UI(stdin.read(4))
    data = ''.join(crc32(stdin.read(UI(stdin.read(4))), salt) for _ in xrange(n))

    fi, fo = os.pipe()
    if not os.fork() :
        os.execl('/home/sc/thisisnotbad', 'thisisnotbad', '%d' % fi)
    else :
        os.write(fo, PI(len(data)))
        os.write(fo, data)

if __name__ == '__main__' :
    main()