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diff --git a/challenge-215/jo-37/perl/ch-1.pl b/challenge-215/jo-37/perl/ch-1.pl
new file mode 100755
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+++ b/challenge-215/jo-37/perl/ch-1.pl
@@ -0,0 +1,61 @@
+#!/usr/bin/perl -s
+
+use v5.24;
+use Test2::V0 '!float';
+use PDL;
+use PDL::Char;
+
+our ($tests, $examples);
+
+run_tests() if $tests || $examples;	# does not return
+
+die <<EOS unless @ARGV;
+usage: $0 [-examples] [-tests] [WORD...]
+
+-examples
+    run the examples from the challenge
+ 
+-tests
+    run some tests
+
+WORD...
+    list of words
+
+EOS
+
+
+### Input and Output
+
+say count_unsorted(@ARGV);
+
+
+### Implementation
+
+# Compare each word with its sorted bytes, find any divergences and
+# count the concerned words.
+
+sub count_unsorted {
+    my $w = PDL::Char->new(@_);
+
+    which(($w <=> $w->qsort)->orover)->dim(0);
+}
+
+
+### Examples and tests
+
+sub run_tests {
+    SKIP: {
+        skip "examples" unless $examples;
+
+        is count_unsorted('abc', 'xyz', 'tsu'), 1, 'example 1';
+        is count_unsorted('rat', 'cab', 'dad'), 3, 'example 2';
+        is count_unsorted('x', 'y', 'z'), 0, 'example 3';
+    }
+
+    SKIP: {
+        skip "tests" unless $tests;
+	}
+
+    done_testing;
+    exit;
+}