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

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

puts len