s = input()

n = len(s)
l = 0
ANS = []
res = 0
cnt = 0
f = 0
for i in range(n):
    if s[i] == 'ｗ':
        res += 1
        if i == n - 1:
            if res > l:
                l = res
                ANS = [s[f:f + cnt]]
            elif res == l:
                ANS.append(s[f:f + cnt])
    else:
        if res == 0:
            cnt += 1
        else:
            if res > l:
                l = res
                ANS = [s[f:f + cnt]]
            elif res == l:
                ANS.append(s[f:f + cnt])
            f += cnt
            cnt = 0
            res = 0
print(*ANS, sep='\n')