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diff --git a/challenge-255/luca-ferrari/plpgsql/ch-1.sql b/challenge-255/luca-ferrari/plpgsql/ch-1.sql
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+--
+-- Perl Weekly Challenge 255
+-- Task 1
+-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-255>
+--
+
+CREATE SCHEMA IF NOT EXISTS pwc255;
+
+CREATE OR REPLACE FUNCTION
+pwc255.task1_plpgsql( origin text, shuffled text )
+RETURNS char
+AS $CODE$
+   SELECT s
+   FROM regexp_split_to_table( shuffled, '' ) s
+   WHERE s NOT IN ( SELECT v
+                    FROM regexp_split_to_table( origin, '' ) v );
+$CODE$
+LANGUAGE sql;