def main():
    s = input()

    l = []
    n = 0
    for c in s[::-1]:
        if c == 'w':
            n += 1
        elif c == 'c':
            l.append(n)

    ans = 0
    for x in l:
        if x >= 2:
            ans += x * (x - 1) // 2
    print(ans)


if __name__ == '__main__':
    main()