s = input()
n = len(s)
ans = n
for i in range(n):
    if s[i] =='w':
        ans = min(ans, i - 1)
        break
for i in range(n - 1, -1, -1):
    if s[i] == 'c':
        ans = min(ans, n - i - 1)
        break
print(ans)