#coding: UTF-8

import sys
from math import log
from collections import deque
from functools import reduce

### defs ###

### main ###
S = sys.stdin.readline().strip('\r\n')
part = []
sntnc = ''
for c in S:
	if (c=='ｗ'):
		if (len(sntnc)!=0 and sntnc[0]!='ｗ'):
			part.append(sntnc)
			sntnc=c
		else:
			sntnc += c
	else:
		if (len(sntnc)!=0 and sntnc[0]=='ｗ'):
			part.append(sntnc)
			sntnc=c
		else:
			sntnc += c
part.append(sntnc)

mx = 0
for i in range(1,len(part)):
	p = part[i]
	if(p[0]=='ｗ'):
		mx = max(mx, len(p))

ans = []
for i in range(1,len(part)):
	p = part[i]
	if(p[0]=='ｗ' and len(p) == mx):
		ans.append(part[i-1])
for a in ans:
	print(a)