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+#!/usr/bin/env python
+
+# Challenge 052
+#
+# TASK #1
+# Stepping Numbers
+# Write a script to accept two numbers between 100 and 999. It should then print
+# all Stepping Numbers between them.
+#
+# A number is called a stepping number if the adjacent digits have a difference
+# of 1. For example, 456 is a stepping number but 129 is not.
+
+import sys
+
+STEPPING_NUMS = [123, 234, 345, 456, 567, 678, 789]
+
+start = int(sys.argv[1])
+end = int(sys.argv[2])
+for n in STEPPING_NUMS:
+    if n >= start and n <= end:
+        print(n)