# your code goes here
str=STDIN.gets
len=-1;

(str.size).times do |i|
	a=str.slice(i,str.size).match(/c[^c]*?w[^w]*?w/i)
	if a
		if len==-1 || a.string.size<len
			len=a.string.size
		end
	end 
end

puts len