import sys
from typing import List, Tuple
import random

int1 = lambda x: int(x) - 1
# input = lambda: sys.stdin.readline().rstrip('\n')
ii = lambda: int(input())
vi = lambda: list(map(int, input().split()))
vi1 = lambda: list(map(int1, input().split()))


def dbg(*args, **kwargs):
    print(*(repr(arg) for arg in args), *(f'{k}: {repr(v)}' for k, v in kwargs.items()),
          sep='; ', file=sys.stderr, flush=True)


def main():
    s = input().lstrip('ｗ')

    ans = []
    answ = 0
    cur = ''
    curw = 0
    for i in s:
        if i == 'ｗ':
            curw += 1
        elif curw == 0:
            cur = cur + i
        else:
            if answ < curw:
                answ = curw
                ans = []
            if answ == curw:
                ans.append(cur)
            cur = i
            curw = 0
    if answ < curw:
        answ = curw
        ans = []
    if answ == curw:
        ans.append(cur)
    cur = ''

    return '\n'.join(ans)


def _start():
    if (ret := main()) is not None:
        print(*ret) if isinstance(ret, List) or isinstance(ret, Tuple) else print(ret)


if __name__ == '__main__':
    _start()