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+#!python
+
+#
+# Perl Weekly Challenge 253
+# Task 1
+#
+# See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-253>
+#
+
+import sys
+import re
+
+# task implementation
+# the return value will be printed
+def task_1( args ):
+    separator   = args[ 0 ];
+    split_words = []
+    for i in range( 1, len( args ) ):
+        current_words = args[ i ]
+        for w in re.split( "[%s]" % separator, current_words ):
+            split_words.append( w )
+
+    return ','.join( split_words )
+
+
+# invoke the main without the command itself
+if __name__ == '__main__':
+    print( task_1( sys.argv[ 1: ] ) )