INPUT can't properly display the unicode Greek charset (while PRINT works as expected).
(In Win7 x64 Ult. GR).
Eg. running the following program (who prints ΑΒΓΔΕ (ABCDE in Greek) with PRINT and INPUT commands),
DIM AS INTEGER N
PRINT "ΑΒΓΔΕ"
INPUT "ΑΒΓΔΕ"; N
returns this output (see screenshot).
I get the same output as shown in the screenshot, but that might be because I have Windows XP set to de_DE. Currently the INPUT command only takes ANSI codepage zstrings, and if a Unicode wstring is given, the compiler converts it first. Apparently if that Unicode -> codepage conversion fails, we get "?????", one '?' per "untranslatable" character.
It's possible that with an fbc 0.25 snapshot including the recent wstring conversion fixes it would display properly on a Windows using the Greek locale.
I think we'd need to add a proper wstring version of INPUT to fix this in general though.