def solve():
    s = input()[::-1]
    wc = 0
    
    res = 0
    for c in s:
        if c == "c":
            if wc >= 2:
                res += (wc * (wc-1)) // 2
            continue
        if c == "w":
            wc += 1
    print(res)
    

if __name__=="__main__":
    solve()