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diff --git a/challenge-266/luca-ferrari/python/ch-1.py b/challenge-266/luca-ferrari/python/ch-1.py
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+#!python
+
+#
+# Perl Weekly Challenge 266
+# Task 1
+#
+# See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-266>
+#
+
+import sys
+
+# task implementation
+# the return value will be printed
+def task_1( args ):
+    left  = args[ 0 ]
+    right = args[ 1 ]
+
+    bag_left  = {}
+    bag_right = {}
+
+    # classify
+    for w in left.split():
+        c = 1
+        w = w.lower()
+        if w in bag_left:
+            c += bag_left[ w ]
+
+        bag_left[ w ] = c
+
+    for w in right.split():
+        c = 1
+        w = w.lower()
+        if w in bag_right:
+            c += bag_right[ w ]
+
+        bag_right[ w ] = c
+
+    words = []
+    for w in bag_left:
+        if bag_left[ w ] == 1 and not w in bag_right:
+            words.append( w )
+
+    for w in bag_right:
+        if bag_right[ w ] == 1 and not w in bag_left:
+            words.append( w )
+
+    return words
+
+
+# invoke the main without the command itself
+if __name__ == '__main__':
+    print( task_1( sys.argv[ 1: ] ) )