That work with PJSF
:0\g,:94+`#@_1+
0"!dlrow olleH">:#,_$@
v v<<<<<<<<<< 0123456789 ^?^ ^ < # > ?#^?^ \#^ ?< > ^ $ :^ < ^#_#v 1+*a<v > :. v +1\ < v,k7"Number "< >a".gib ooT"9k, ^ >:." :sseug"7k,\:&w" ylnO"5k,$. a" !sesseug"ak,@ >a".llams ooT"bk,^
> v >;#"Type a number: "<;>:#,_v @Get first number v < > v >&^>;#"Type another: "0<;>:#,_v @Get second number v < >$&+.v @get rid of extra 0, add two numbers and output q @Quitor:
<+_v#:&,><@,>' a.$<@,Type numbers until you get bored, then type 0 (zero). It will output the sum.