I agree. a, ć, ę, ń, ł, ó, ś, ź and ż is what makes a text recognisable as Polish.
exactly.
same goes for Slovak and Czech, with their accented long vowels, as oppose to Croatian/Slovenian, etc.
I can easily identify any written Slavic language, whether it be using latin or cyrillic alphabet... even languages like Kaszubski . :))