Merge remote-tracking branch 'upstream/master'

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diff --git a/challenge-111/abigail/python/ch-2.py b/challenge-111/abigail/python/ch-2.py
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+++ b/challenge-111/abigail/python/ch-2.py
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+#!/opt/local/bin/python
+
+#
+# See ../README.md
+#
+
+#
+# Run as: python ch-2.py < input-file
+#
+
+import fileinput
+import string
+import re
+
+
+#
+# Create a pattern which matches words with their characters in lexical order.
+#
+pat = "^"
+for x in list (string . ascii_lowercase):
+    pat = pat + x + "*"
+pat += "$"
+    
+
+#
+# Match strings with their characters in lexical order, and remember
+# the longest of them.
+#
+longest = ""
+for line in fileinput . input ():
+    line = line . strip ()
+    if re . match (pat, line . lower ()) and len (line) > len (longest):
+        longest = line
+
+print (longest)