Azizi, I'm posting from France, the Polish thing was in my Polish/French dictionary BUT sorry, I didn't read all the explanation about "dz" and got it wrong, it says that "ę" (I copied/pasted and it didn't show properly) is pronounced like French "in" but that it's denasalized before some consonants including "k". I actually didn't check on line. But here and there it sounds different from on Bobad's link, it sounds Djen/Jen-koo-yen with "en" sounding like the French "in".