Incidentally, why are you using a hash for this? The month numbers are sequential; 
@mesiac = qw(Január Február Marec Apríl Máj Jún Júl August September O
+któber November December);

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The only difference is that the arrays are 0-based; you'd do $mesiac[0] for January instead of $mesiac{1}.
--Stevie-O 
$"=$,,$_=q>|\p4<6 8p<M/_|<('=>
.q>.<4-KI<l|2$<6%s!<qn#F<>;$,
.=pack'N*',"@{[unpack'C*',$_]
}"for split/</;$_=$,,y[A-Z a-z]
         {}cd;print lc

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In reply to Re: Slovak language characters by Stevie-O
in thread Slovak language characters by Wampa

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