import re
from collections import defaultdict
from sys import stdin, stdout

input = lambda: stdin.readline()
write = stdout.write

def main():
    S = input()

    regex = r'(ｗ+)'
    s = re.split(regex, S.lstrip('ｗ'))
    dic_ = defaultdict(list)
    maxlen = 0
    for i in range(0, len(s) - 1, 2):
        l = len(s[i+1])
        maxlen = max(maxlen, l)
        dic_[l].append(s[i])

    print(*dic_[maxlen], sep='\n')

main()