import socket, time

sock = socket.socket()
sock.connect(('jh2i.com', 50003))
time.sleep(1)
data = sock.recv(1024).replace(b'\r', b'').decode()
print(data)

solution script: solution.py

flag is flag{this_netcat_says_meow}

Original writeup (https://github.com/wetox-team/writeup/tree/master/hacktivitycon/internet_cattos).