from sys import stdin, stdout

input = lambda: stdin.readline()
write = stdout.write

def main():
    S = input()

    cww, w = 0, 0
    for s in S[::-1]:
        if s == 'w':
            w += 1
        elif s == 'c':
            cww += w * (w - 1) // 2
    print(cww)

main()