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diff --git a/challenge-045/paulo-custodio/python/ch-1.py b/challenge-045/paulo-custodio/python/ch-1.py
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+#!/usr/bin/env python3
+
+# Challenge 045
+#
+# TASK #1
+# Square Secret Code
+#
+# The square secret code mechanism first removes any space from the original
+# message. Then it lays down the message in a row of 8 columns. The coded
+# message is then obtained by reading down the columns going left to right.
+#
+# For example, the message is "The quick brown fox jumps over the lazy dog".
+#
+# Then the message would be laid out as below:
+#
+# thequick
+# brownfox
+# jumpsove
+# rthelazy
+# dog
+#
+# The code message would be as below:
+#
+# tbjrd hruto eomhg qwpe unsl ifoa covz kxey
+#
+# Write a script that accepts a message from command line and prints the
+# equivalent coded message.
+
+import re
+import sys
+
+def encode(text):
+    text, dummy = re.subn(r'\W+', '', text)
+    box = []
+    while text != '':
+        box.append(text[0:8])
+        text = text[8:]
+    encoded = []
+    while True:
+        box = [x for x in filter(lambda x: x != '', box)]
+        if len(box) == 0:
+            break;
+        word = ""
+        for i in range(len(box)):
+            if len(box[i]) > 0:
+                word += box[i][0]
+                box[i] = box[i][1:]
+        encoded.append(word)
+    return encoded
+
+print(' '.join(encode(''.join(sys.argv[1:]))))