Python solutions for week 135

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diff --git a/challenge-135/abigail/python/ch-1.py b/challenge-135/abigail/python/ch-1.py
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+++ b/challenge-135/abigail/python/ch-1.py
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+#!/opt/local/bin/python
+
+#
+# See ../README.md
+#
+
+#
+# Run as: python ch-1.py < input-file
+#
+
+import fileinput
+import re
+
+for line in fileinput . input ():
+    line = re . sub (r'^[-+]', '', line . strip ())
+    ll = len (line)
+    if re . search (r'[^0-9]', line):
+        print ("not an integer")
+    elif ll % 2 == 0:
+        print ("even number of digits")
+    elif ll < 3:
+        print ("too short")
+    else:
+        print (line [(ll - 3) // 2 : (ll + 3) // 2])