s = input()
ls = len(s)

c_list = []
w_counter = 0

for i in range(ls):
    if s[ls-i-1] == "c":
        c_list.append(w_counter)
    elif s[ls-i-1] == "w":
        w_counter += 1


sum_list = [0]
for i in range(w_counter+1):
    sum_list.append(sum_list[-1]+i)

c_list = [ sum_list[c_list[i]] for i in range(len(c_list))]
print(sum(c_list))