Group A has to be the least remarkable of the four groups in the Euros this year.
Poland seems to have a handful of top players like Szczesny (bless you) from Arsenal, Pisczczek, Blasczykowski, and Lewandowski from German Budesliga champions Dortmund. I won't name the rest because there names are too difficult to type.
Greece actually won the tournament about a decade ago, but it is hard to see them doing anything except maybe advancing from their unremarkable group with their mediocre squad. Russia and Czech Republic fall in the same boat again with very average sides for this tournament.
My pick for this group is Poland to take the top spot and then Russia to grap the second spot. To be honest though, I don't know much about these groups other than a handful of Polish players.