s = input() + "+"
while s and s[0]=="ｗ" : s = s[1:]
ans =[]
M=0
cnt=0
s2=""

for si in s:
	if si == "ｗ":
		cnt+=1
	else:
		if cnt > 0:
			if cnt ==M:
				ans.append(s2)
			elif cnt > M:
				ans=[s2]
			M = max(M,cnt)
			cnt = 0
			s2=""
		s2+=si

for a in ans:
	print(a)