S = input()
N = len(S)
cnt = 0
for i in range(N - 2):
    if S[i] == "c" and S[i+1] == "c" and S[i+2] == "w":
        cnt += 1

if cnt == 0:
    print(0)
    exit()
    
ans = 10 ** 18
c = 0
for i in range(N - 2):
    if S[i] == "c" and S[i+1] == "c" and S[i+2] == "w":
        c += 1
        if c == cnt:
            ans = min(ans, i + 1)
            
c = 0
for i in range(N - 1, 1, -1):
    if S[i] == "w" and S[i-1] == "c" and S[i-2] == "c":
        c += 1
        if c == cnt:
            ans = min(ans, N - i)
            
print(ans)