s = input() + "+"
while s and s[0] == "ｗ": s = s[1:]
ans = []
mxc = 0
curc = 0
sent = ""
for si in s:
    if si == "ｗ":
        curc += 1
    else:
        if curc > 0:
            if curc == mxc:
                ans.append(sent)
            elif curc > mxc:
                ans = [sent]
            mxc = max(mxc, curc)
            curc = 0
            sent = ""
        sent += si
for a in ans:
    print(a)