Hmmm.
for (map "A$_", sort { $a <=> $b } map /^A\d+$/ ? substr($_,1) : (), @
+array) {
...
Just another way. I am assuming you wanted numeric comparison. I also took the liberty of filtering out inputs not of the form A followed by numeric digits. Apologies for allowing neither negatives nor decimals.
Although:
for (sort grep /^A/, @array) {
...
Would work if you just want it for strings starting with A.
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