#!/usr/bin/env python2
# -*- coding: utf-8 -*-

import os
import time
import sys
from pwn import *

times = list()

flag = list("...............................................................")
charset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789{}_"
target = ""


def main(binary):
    j = 0
    m = len(flag)
    for x in xrange(0, len(flag)):
        if x % 2 == 0:
            print '%d%%' % (x * 100 / m)
        for y in xrange(0, len(charset)):
            flag[x] = charset[y]
            startTime = time.time()
            os.system('echo "{}" | {} > /dev/null'.format(''.join(flag), binary))
            times.append(time.time() - startTime)
        flag[x] = charset[times.index(max(times))]
        del times[:]
        pass
    print "The flag is : " + ''.join(flag)

if __name__ == '__main__':
    main(sys.argv[1])