Are you sure that %alphabet contains data? None of the code above shows us how data gets in there... and if data gets in there for likely values of $s.

Is it issuing this warning multiple times for the same run? Otherwise: you get an error the first time through because you never set $alphabet{$s} to anything for its first use, but at the end of your sub, you ++ it, which means that thereafter it has a valid value (i.e. has been "initialized").

In reply to Re: uninitialized value in modulus (%) by ichimunki
in thread uninitialized value in modulus (%) by alexiskb

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