from sys import stdin

def solve():
    s = input()
    wc = s.count('w')
    ans = 0

    for ch in s:
        if ch == 'c':
            ans += wc * (wc - 1) // 2
        elif ch == 'w':
            wc -= 1

    print(ans)

def debug(x, table):
    for name, val in table.items():
        if x is val:
            print('DEBUG:{} -> {}'.format(name, val), file=sys.stderr)
            return None

if __name__ == '__main__':
    solve()