#coding:utf-8
import re
s=raw_input()
r=re.compile(".+?(?:ｗ)+")
m=r.findall(s)
t=[(i.count("ｗ"),i) for i in m if len(i.replace("ｗ",""))>0]
if len(t)==0:
	exit()
m=max([i[0] for i in t])
t=[i[1].replace("ｗ","") for i in t if i[0]==m]
print "\n".join(t)