Submission #8323

---

Source Code Expand

n = STDIN.gets.to_i
command = STDIN.gets.chomp
btns = [ "A","B","X","Y" ]

len = command.length
btns.each do |u|
  btns.each do |v|
    one_replace = command.gsub u+v, "1"
    btns.each do |w|
      btns.each do |z|
        result = one_replace.gsub w+z, "2"
        len = result.length if len > result.length
      end
    end
  end
end

printf "%d\n", len

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