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+#!/usr/bin/env perl
+
+# Challenge 282
+#
+# Task 2: Changing Keys
+# Submitted by: Mohammad Sajid Anwar
+#
+# You are given an alphabetic string, $str, as typed by user.
+#
+# Write a script to find the number of times user had to change the key to type
+# the given string. Changing key is defined as using a key different from the
+# last used key. The shift and caps lock keys won't be counted.
+#
+# Example 1
+#
+# Input: $str = 'pPeERrLl'
+# Ouput: 3
+#
+# p -> P : 0 key change
+# P -> e : 1 key change
+# e -> E : 0 key change
+# E -> R : 1 key change
+# R -> r : 0 key change
+# r -> L : 1 key change
+# L -> l : 0 key change
+#
+# Example 2
+#
+# Input: $str = 'rRr'
+# Ouput: 0
+#
+# Example 3
+#
+# Input: $str = 'GoO'
+# Ouput: 1
+
+import re
+import sys
+
+str = sys.argv[1].upper()
+str, count = re.subn(r'(.)\1*', r'\1', str)
+
+print(len(str)-1)