S = input()
p = S.find('c')
ans = -1
while p >= 0:
    S = S[p:]
    cnt = 0
    for i in range(len(S)):
        if S[i] == 'w':
            cnt += 1
            if cnt == 2:
                if ans == -1:
                    ans = i + 1
                else:
                    ans = min(ans, i + 1)
    S = S[1:]
    p = S.find('c')
print(ans)