Is it impossible to use the input from web application for being an another's application then show the output in web application

i'm trying to make web application server. I want to use the input from web application for being an another's application input then show the output in web application. Example:

1. User imports number 1 and number 2 in web application.
2. Then using both of them for being an another's application input (such as Calculator) to plus 1 and 2.
3. Finally, show the result in web application.

Thanks you