def solve():
    s = input()
    cl, wl = [], []

    slen = len(s)
    for i in range(slen):
        if s[i] == "c":
            cl.append(i)
            continue
        elif s[i] == "w":
            wl.append(i)

    res = 0
    for cidx in cl:
        wl = [i for i in wl if i > cidx]
        wlen = len(wl)
        if wlen < 2:
            break
        res += (wlen * (wlen-1)) // 2
    print(res)

if __name__=="__main__":
    solve()