#!/usr/bin/env python
'''
  _______ _          ______     _    __  __
 |__   __| |        |___  /    | |  |  \/  |
    | |  | |__   ___   / / __ _| | _| \  / | __ _ _ __
    | |  | '_ \ / _ \ / / / _` | |/ / |\/| |/ _` | '_ \
    | |  | | | |  __// /_| (_| |   <| |  | | (_| | | | |
    |_|  |_| |_|\___/_____\__,_|_|\_\_|  |_|\__,_|_| |_|

                                      PS: Valeu Nutcake!


'''

import sys, socket, struct

print '[!] Fuzzando:'

flag = ""
erro = "0.0"


while True:


    for x in xrange(25,255):
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        s.connect(("imesec.ime.usp.br", 9999))

        fuzz = chr(x)

        resInicial = s.recv(1024)
        s.send(flag+fuzz + "\r")
        res =  s.recv(1024),"\n"
        s.send( fuzz + "\r")
        check = res[0].split()

        if check[1] == erro :
            pass
        else:
            print check[1]
            flag = flag + fuzz
            erro = check[1]
            break

            s.close()

    print flag