Challenge 026 task 1

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diff --git a/challenge-026/jo-37/perl/ch-1.pl b/challenge-026/jo-37/perl/ch-1.pl
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+#!/usr/bin/perl -s
+
+use v5.16;
+use Test2::V0;
+use warnings FATAL => 'all';
+use Data::Dump qw(dd pp);
+use experimental qw(signatures postderef);
+
+our ($tests, $examples, $verbose);
+
+run_tests() if $tests || $examples;	# does not return
+
+die <<EOS unless @ARGV == 2;
+usage: $0 [-examples] [-tests] [STONES JEWELS]
+
+-examples
+    run the examples from the challenge
+ 
+-tests
+    run some tests
+
+STONES JEWELS
+    count alphabet from STONES in JEWELS
+
+EOS
+
+
+### Input and Output
+
+say count_alphabet(@ARGV);
+
+
+### Implementation
+
+sub count_alphabet ($stones, $jewels) {
+    my %jewels;
+    @jewels{split //, $jewels} = (1) x length($jewels);
+    scalar grep $_, @jewels{split //, $stones};
+}
+
+
+### Examples and tests
+
+sub run_tests {
+    SKIP: {
+        skip "examples" unless $examples;
+
+        is count_alphabet("chancellor", "chocolate"), 8, 'example';
+    }
+
+    SKIP: {
+        skip "tests" unless $tests;
+	}
+
+    done_testing;
+    exit;
+}