s_list = gets.chomp.split(/(ｗ+)/)
m = 0
w_list = []
s_list.each_with_index do |s, i|
  t = s.count('ｗ')
  if t > m
    w_list = [i]
    m = t
  elsif t == m
    w_list << i
  end
end

if m == 0 or (s_list.length == 2 and s_list[0].length == 0)
  puts
else
  w_list.each do |w|
    puts s_list[w - 1] if s_list[w - 1].length > 0
  end
end