S = input()
NS = len(S)
ans = []
maxw = 1
i = 0
while i <= NS and  S[i] == "ｗ":
    i += 1
while i < NS:
    tmp = ""
    while i < NS and S[i] != "ｗ":
        tmp += S[i]
        i += 1
    j = 0
    while i < NS and S[i] == "ｗ":
        i += 1
        j += 1
    if j == maxw:
        ans.append(tmp)
    elif j > maxw:
        maxw = j
        ans = [tmp]
for a in ans:
    print(a)