Help with parsing strings!

[Cenzoooo]

Hello Python community!

I have problems with simple script which i created for gathering specific data from routers, so I would appreciate your help!

My script should do next:

1. SSH to router and type command "show system licence"
2. Output of that command is in few rows and columns, but I need to take specific part of string and print it out

I stucked at part 2, here is my code: 

import paramiko,string

JUNuser = 'xxx'
JUNpass = 'xxx'
JUNhost = 'xxx'

ssh = paramiko.SSHClient()

ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh.connect(JUNhost, username=JUNuser, password=JUNpass)
stdin, stdout, stderr = ssh.exec_command("show system license")

output = stdout.readlines()
type(output)
final = output[3:4]
print '\n'.join(final) 

With this i managed to get specific row from original output.
Original output looks like:

Output:
License usage: 
                                 Licenses           Licenses           Licenses            Expiry
  Feature name             used               installed           needed 
  scale-subscriber               0                 1000                  0                41 days

With part "final = output[3:4]" i managed to get:

Output:
scale-subscriber                      0         1000           0    41 days

What I want to achieve is to tell my script to get only this number of days when licence expire. So I want my script to show me only number 41!

Do you guys have idea how to do that? I am python beginner so be nice to me :)

Best Regards!