now it will not work for 
```Shell
python sonoshell.py 10.x.x.x play -2
python sonoshell.py 10.x.x.x play 2-
python sonoshell.py 10.x.x.x play --2
python sonoshell.py 10.x.x.x play 2a
python sonoshell.py 10.x.x.x play a2
python sonoshell.py 10.x.x.x play foo
```
what does work is
```Shell
python sonoshell.py 10.x.x.x play 2
python sonoshell.py 10.x.x.x play +2
```

+ implies a positive integer, I don't really see anyone typing it, but at the same it wouldn't be incorrect to do, so I guess we can allow it.