def solve():
    s = input()
    cl = []
    wc, cllen = 0, 0
    
    for c in s:
        if c == "c":
            cl.append(0)
            cllen += 1
            continue
        if c == "w":
            for i in range(cllen):
                cl[i] += 1
    res = 0
    for i in cl:
        if i < 2:
            break
        res += i * (i - 1) // 2
    print(res)

if __name__=="__main__":
    solve()