# -*- coding: utf-8 -*-

import re

S = input()

pattern = r'ｗ+'
segments = list(re.split(pattern, S))
matched_list = re.findall(pattern, S)
max_w = 0
for s in matched_list:
    max_w = max(max_w, len(s))

for i in range(len(segments)):
    if i<len(matched_list) and len(segments[i])>0 and len(matched_list[i])==max_w:
        print(str(segments[i]))