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- s = gets.chomp
- n = s.length
- a = 0
- n.times do |i|
- if i.even?
- if s[i] != "0"
- a += 1
- end
- else
- if s[i] != "1"
- a += 1
- end
- end
- end
- b = 0
- n.times do |i|
- if i.even?
- if s[i] != "1"
- b += 1
- end
- else
- if s[i] != "0"
- b += 1
- end
- end
- end
- puts [a, b].min
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