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diff --git a/challenge-347/luca-ferrari/python/ch-2.py b/challenge-347/luca-ferrari/python/ch-2.py
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+#!python
+
+#
+# Perl Weekly Challenge 347
+# Task 2
+#
+# See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-347>
+#
+
+import sys
+
+
+# task implementation
+# the return value will be printed
+def task_2( args ):
+    phone = args[ 0 ].replace( '-', '' ).replace( ' ', '' )
+
+    groups = []
+    while len( phone ) > 0:
+        if len( phone ) >= 3:
+            groups.append( phone[ 0 : 3 ] )
+            phone = phone[ 3: ]
+        else:
+            groups.append( phone )
+            phone = ''
+
+    if len( groups[ -1 ] ) != 2 and len( groups[ -1 ] ) != 3:
+        begin = groups[ -2 ]
+        end   = groups[ -1 ]
+        last  = begin + end
+        groups[ -2 ] = last[ 0 : 2 ]
+        groups[ -1 ] = last[ 2 : 4 ]
+
+    return '-'.join( groups )
+
+# invoke the main without the command itself
+if __name__ == '__main__':
+    print( task_2( sys.argv[ 1: ] ) )