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+--
+-- Perl Weekly Challenge 258
+-- Task 1
+-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-258>
+--
+
+CREATE SCHEMA IF NOT EXISTS pwc258;
+
+CREATE OR REPLACE FUNCTION
+pwc258.task1_plpgsql( nums int[] )
+RETURNS int
+AS $CODE$
+   WITH q_nums AS (
+   	SELECT v, array_length( regexp_split_to_array( v::text, '' ), 1 ) as c
+	FROM unnest( nums ) v
+	)
+	SELECT count( * )
+	FROM q_nums
+	WHERE c % 2 = 0;
+
+$CODE$
+LANGUAGE sql;