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+# Task 1: Keyboard Word
+# Submitted by: Mohammad S Anwar
+# 
+# You are given an array of words.
+# Write a script to print all the words in the given array that can be types using alphabet on only one row of the keyboard.
+# 
+# Let us assume the keys are arranged as below:
+# Row 1: qwertyuiop
+# Row 2: asdfghjkl
+# Row 3: zxcvbnm
+# 
+# Example 1
+# Input: @words = ("Hello","Alaska","Dad","Peace")
+# Output: ("Alaska","Dad")
+# 
+# Example 2
+# Input: @array = ("OMG","Bye")
+# Output: ()
+
+import re
+import sys
+
+if __name__ == "__main__":
+    aclass = {'qwertyuiop', 'asdfghjkl', 'zxcvbnm'}
+ 
+    output = set()
+    for word in sys.argv[1:]:
+        if len(list(filter(lambda x: re.search(r'^['+x+']+$', word.lower()), aclass))):
+            output.add(word)
+    print("Output: ({:s})".format(', '.join(output)))