import math

S = input()
l = list(S)
l.reverse()
w_count = 0
sum = 0

for l_i in l:
    if l_i == "w":
        w_count += 1
    if l_i == "c":
        if w_count >= 2:
            sum += (w_count * (w_count -1)) // 2 

print(sum)