import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

S = read().decode()

c = 0
cw = 0
cww = 0

for x in S:
    if x == 'c':
        c += 1
    if x == 'w':
        cww += cw
        cw += c

print(cww)