import re

def main():
    S = input()

    if len(S) < 3 or 'c' not in S or 'w' not in S:
        print(0)
        return

    ans = 0
    s = re.findall(r'[cw]', S)
    ci = [i for i, x in enumerate(s) if x == 'c']
    for i in ci:
        w = s[i:].count('w') - 1
        ans += w * (w + 1) // 2

    print(ans)

main()