s=gets
ac=0
fr=''
last=false
ls = []
for i in 0...s.size
  if s[i] == 'ｗ'
    ac += 1
    last = true
  else
    if last and fr!=''
      ls << [ac, fr]
      ac=0
      fr=''
    end
    last=false
    fr += s[i]
  end
end

n = ls.map{|a|a[0]}.max
for x,f in ls
  puts f if n == x
end