```
import socket

s = socket.socket()

port = 13372
host = 'crypto.ctf.umbccd.io'

s.connect((host, port))

s.send(b'flg')
flag=(s.recv(1024))
#print(flag)
s.send(b'enc:test')
r=(s.recv(1024))
#print(r)
iv=r[0:16]
#print(iv)
s.send(b'dec:'+iv+flag)
r=(s.recv(1024))
print(r)
s.close()
```