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diff --git a/challenge-100/abigail/python/ch-1.py b/challenge-100/abigail/python/ch-1.py
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+++ b/challenge-100/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 ():
+    #
+    # Parse input
+    #
+    hour, minute, ampm = re . compile (r'([0-9]+):([0-9]+)\s*([ap]?)') \
+                            . match (line)                             \
+                            . groups ()
+    #
+    # Make sure we have integers
+    #
+    hour   = int (hour)
+    minute = int (minute)
+
+    #
+    # Calculate new AM/PM marker
+    #
+    new_ampm = ""
+    if ampm == "":
+        if hour >= 12:
+            new_ampm = "pm"
+        else:
+            new_ampm = "am"
+
+    #
+    # Calculate new hour
+    #
+    hour = hour % 12
+    if ampm == "" and hour == 0:
+        hour = 12
+    if ampm == "p":
+        hour = hour + 12
+
+    #
+    # Print result
+    #
+    print ("{:02d}:{:02d}{:s}" . format (hour, minute, new_ampm))