from functools import reduce
from operator import mul

# nC2
def combi(n):
    return (n * (n-1)) // 2
    
def solve():
    s = input()
    cl, wl = [], []

    slen = len(s)
    for i in range(slen):
        if s[i] == "c":
            cl.append(i)
            continue
        elif s[i] == "w":
            wl.append(i)
    
    res = 0
    for cidx in cl:
        wlen = len([0 for i in wl if i > cidx])
        if wlen < 2:
            break
        res += combi(wlen)
    print(res)

if __name__=="__main__":
    solve()