str = gets.chomp.split('')

min = 101
w = 0
str.each_with_index do |e, i|
  if e == 'c'
    w = 0
    (i...str.size).each do |j|
      w += 1 if str[j] == 'w'
      if w == 2
        tmp = (j + 1) - i
        min = tmp if tmp < min
        break
      end
    end
  end
end
min = -1 if min == 101
p min