There could be more than one longest words having the same length, you probably want all of them:
use strict;
my @words = ("one", "two", "123456789012345", "three", "four", "sumofa
+llnumbers", "five", "six", "seven", "eight");
my @sorted_words = sort {length($b) <=> length($a)} @words;
my @longest_words = grep (/.{$#sorted_words}/, @words);
print join(",", @longest_words);
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