def fact(n):
    if n == 0: return 1
    return n * fact(n-1)

def solve():
    S = input()
    ans = 0
    for i in range(len(S)-2):
        if S[i] == 'c':
            w_count = S[i+1:].count('w')
            if w_count >= 2:
                ans += fact(w_count) / fact(2) / fact(w_count -2 )
    print('%d' % ans)


solve()