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# p ARGF.read.strip.chars.map(&:to_i).each_cons(2).select {|a,b| a == b }.map(&:first).sum
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a = ARGF.read.strip.chars.map(&:to_i)
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b = a.rotate(a.size/2)
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p a.zip(b).select {|a,b| a == b }.map(&:first).sum
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