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Labyrinth, 80 bytes

?::`}:("(!@
perfect:
{:{:;%"}
+puts; "
}zero: "
}else{(:
"negI" _~
""""""{{{"!@

The Latin characters perfect puts zero else neg I are actually just comments*.
i.e. if the input is perfect a 0 is printed, otherwise -1 is.

Try it online!

---

* so this works too...

?::`}:("(!@
 :
{:{:;%"}
+ ; "
} : "
} {(:
" " _~
""""""{{{"!@