Ahh, then it's just a matter of asking for the right print! The idiom for "extract a column while printing" is known, and reusable:
my @AoA = map [split], <DATA>;
print join(", ", map $AoA[0][$_], 0..$#{$AoA[0]}), "\n";
-- Randal L. Schwartz, Perl hacker
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