
What would you like to do?
 1) Add
 2) Subtract
 3) Quit
Option: <<1>>
Number 1: <<10>>
Number 2: <<2>>
``12;add;20``

What would you like to do?
 1) Add
 2) Subtract
 3) Quit
Option: <<2>>
Number 1: <<42>>
Number 2: <<20>>
``22;subtract;20``

What would you like to do?
 1) Add
 2) Subtract
 3) Quit
Option: <<1>>
Number 1: <<50>>
Number 2: <<50>>
``100;add2;20``

What would you like to do?
 1) Add
 2) Subtract
 3) Quit
Option: <<foo>>
Unrecognized response: ``foo;unrecognized-input;20``

What would you like to do?
 1) Add
 2) Subtract
 3) Quit
Option: <<3>>
