from itertools import accumulate


def main():
    S = input()

    w_count_list = [0]

    for letter in S:
        match letter:
            case "w":
                w_count_list[-1] += 1
            case "c":
                w_count_list.append(0)
    w_count_sum = list(accumulate(reversed(w_count_list)))
    w_count_sum = w_count_sum[:-1]
    if not w_count_sum:
        print(0)
        return

    patterns = 0

    for w_count in w_count_sum:
        if w_count < 2:
            continue
        patterns += (w_count * (w_count - 1)) // 2
    print(patterns)


if __name__ == "__main__":
    main()