#!/usr/bin/env python3
#coding:utf-8
from __future__ import unicode_literals
import math
from sys import stdin
# import numpy as np
# from matplotlib import pyplot as plt



def main():
	read=stdin.readline

	#edit here!
	s=read().decode('utf-8')

	cnt=0
	maxv=0
	x=""
	ans=[]
	for i in s:
		if i=='ｗ':
			cnt+=1
		else:
			if x!="" and maxv < cnt:
				
				maxv=cnt
				ans=[]
				ans.append(x)
			elif cnt>0 and maxv==cnt:
				ans.append(x)
			
			if cnt==0:
				x+=i
			else:
				x=i
			cnt=0

	for i in ans:
		print(i)
if __name__ == '__main__':
    main()