def main():
    S = input()

    if len(S) < 3 or 'c' not in S or 'w' not in S:
        print(0)
        return

    ans = 0
    ci = srch_all('c', S)
    for i in ci:
        w = S[i:].count('w') - 1
        ans += w * (w + 1) // 2

    print(ans)

def srch_all(ptn, str):
    idx = []
    i = -1
    for _ in range(100000):
        i = str.find(ptn, i + 1)
        if i > -1:
            idx.append(i)
        else:
            break
    return idx

main()