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#!/usr/bin/ruby
#
# See ../README.md
#
#
# Run as: ruby ch-1.rb < input-file
#
ARGF . each_line do
| line |
line = line . strip() . gsub(/^[-+]/, "")
ll = line . length
if line . match (/[^0-9]/) then
puts ("not an integer")
elsif ll % 2 == 0 then
puts ("even number of digits")
elsif ll < 3 then
puts ("too short")
else
puts (line [((ll - 3) / 2) . to_i .. ((ll + 2) / 2) . to_i])
end
end
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