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diff --git a/challenge-136/abigail/ruby/ch-1.rb b/challenge-136/abigail/ruby/ch-1.rb
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+++ b/challenge-136/abigail/ruby/ch-1.rb
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+#!/usr/bin/ruby
+
+#
+# See ../README.md
+#
+ 
+#
+# Run as: ruby ch-1.rb < input-file
+#
+
+ARGF . each_line do
+    | line |
+    m, n = line . split . map {|x| x . to_i}
+    gcd = m . gcd (n)
+    valid = 0
+    if gcd > 1 then
+        while gcd % 2 == 0 do
+            gcd /= 2
+        end
+        if gcd == 1 then
+            valid = 1
+        end
+    end
+    puts (valid)
+end