New syscall enabled  Go to the The BrownOS challenge

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import re
import time
import socket
 
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)sock.connect(('wc3.wechall.net', 61221))
while True:
        data = raw_input('Cmd?:')
        data = re.sub('[^A-Za-z0-9]', '', data)
        data = re.findall('..', data)        data = ''.join([chr(int(x, 16)) for x in data])
        print('Sending: %r' % (data,))
        now = time.time()
        sock.send(data)
        print('Received: %r' % (sock.recv(10000), ))        print('Execution took: %.2f seconds' % (time.time() - now))