# dp[i][c count, cw count, cww count]

S = input()
N = len(S)

dp = [[0]*3 for i in range(N+1)]

for i in range(1, N+1):
    s = S[i-1]
    for j in range(3):
        dp[i][j] += dp[i-1][j]
    
    if s == 'c':
        dp[i][0] += 1
    elif s == 'w':
        dp[i][1] += dp[i-1][0]
        dp[i][2] += dp[i-1][1]
    #print(dp[i])

ans = dp[N][2]
print(ans)