# -*- coding: utf-8 -*-
"""
No.342 一番ワロタｗｗ
https://yukicoder.me/problems/no/342

"""
import sys
from sys import stdin
import re
input = stdin.readline


def solve(S):
    p = re.compile(r'([^ｗ]+?)(ｗ+)')
    res = p.findall(S)

    max_w = 0
    for r in res:
        max_w = max(max_w, len(r[1]))

    ans = []
    for r in res:
        if len(r[1]) == max_w:
            ans.append(r[0])
    return ans


def main(args):
    S = input().strip()
    ans = solve(S)
    print(*ans, sep='\n')


if __name__ == '__main__':
    main(sys.argv[1:])