Fist string:

"This is an example of a simple test. If you did not un-derstand the
ciphering algorithm yet,"

and result of first string:

"sihT si na elpmaxe fo a elpmis tset. fI uoy did ton dnatsrednu eht
gnirehpic mhtirogla tey,"

What about symbol "-"?????????????

> Fist string:
>
> "This is an example of a simple test. If you did not un-derstand
the
> ciphering algorithm yet,"
>
> and result of first string:
>
> "sihT si na elpmaxe fo a elpmis tset. fI uoy did ton dnatsrednu eht
> gnirehpic mhtirogla tey,"
>
> What about symbol "-"?????????????
>
The symbol "-" is not correct. Forget it.