Unhappy

The title of this article is not correct because of technical limitations. The correct title is actually :(.

Not to be confused with (, Ↄ, nor ):.

This article is not detailed enough and needs to be expanded. Please help us by adding some more information.

Commands

a~z : variables. They should be inputted in console. When they are inputted, it prints itself every time it is called.
A~Z : define a function when ; is not met. When they are called twice, the program will run the function.
% : make a Brainfuck interpreter.
> : call the class and call the function.
0~9 : Define a class until ; is met.
; : end a class or a function.
: : separate a class or function from code.

0:A:a;;
0>A

This only works when input is "Hello,world".

0:A:a;;
0>A