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diff --git a/challenge-111/abigail/python/ch-1.py b/challenge-111/abigail/python/ch-1.py
new file mode 100644
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+++ b/challenge-111/abigail/python/ch-1.py
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+#!/opt/local/bin/python
+
+#
+# See ../README.md
+#
+
+#
+# Run as: python ch-1.py < input-file
+#
+
+MATRIX_SIZE = 5
+
+import fileinput
+import re
+
+#
+# Read in the matrix
+#
+matrix = {}
+for i in range (MATRIX_SIZE):
+    for n in re . findall (r'-?[0-9]+', input ()):
+        matrix [n] = 1
+
+#
+# For the rest of the input, check whether it's in the matrix
+#
+for line in fileinput . input ():
+    if line . strip () in matrix:
+        print ("1")
+    else:
+        print ("0")