1 files changed, 42 insertions, 0 deletions
diff --git a/challenge-238/luca-ferrari/python/ch-2.py b/challenge-238/luca-ferrari/python/ch-2.py
new file mode 100644
index 0000000000..183d67e65d
--- /dev/null
+++ b/challenge-238/luca-ferrari/python/ch-2.py
@@ -0,0 +1,42 @@
+#!python
+
+import sys
+import collections
+
+def reduce( n ):
+    if n <= 9:
+        return n
+
+    multiplication = 1
+    for digit in map( int, str( n ) ):
+        multiplication *= digit
+
+    return multiplication
+
+
+def main( argv ):
+    steps = {}
+    for n in map( int, argv ):
+        current_step = 0
+        if n > 9:
+            # need reduction
+            current_value = n
+            while current_value > 9:
+                current_value = reduce( current_value )
+                current_step += 1
+
+        # if the key is not here, create a list
+        if not str( current_step )  in steps:
+            steps[ str( current_step ) ] = []
+
+        steps[ str(current_step) ].append( n )
+
+    # now traverse the dictionary and sort the array
+    # and print it
+    for k, v in collections.OrderedDict(sorted(steps.items())).items():
+        print( ", ".join( map( str, v ) ) )
+
+
+
+if __name__ == '__main__':
+    main( sys.argv[ 1: ] )