# -*- coding: utf-8 -*-
import codecs
import sys

sys.stdin = codecs.getreader('utf_8')(sys.stdin)
sys.stdout = codecs.getwriter('utf_8')(sys.stdout)
A = raw_input()
current = 0
mx = 0
first_char = False
for a in A:
    if first_char and a == u"ｗ":
        current += 1
        mx = max(mx, current)
    else:
        first_char = True
        current = 0

buf = ""
old = ""
output = False
for a in A:

    if a == u"ｗ":
        current += 1
        if current == mx:
            print buf
            output = True

    else:
        if old == u"ｗ":
            buf = ""
        current = 0
        buf += a

    old = a

if not output:
    print ""