s = input()
L=0
for i in range(len(s)):
    if s[i] == "c":
        for ii in range(i+1, len(s)):
            if s[ii] == "w":
                for iii in range(ii+1, len(s)):
                    if s[iii]=="w":
                        if L < iii-i+1:
                            L = iii-i+1
if L == 0:
    print(-1)
else:
    print(L)