#include<iostream>
#include<string>
#include<algorithm>
#include<cctype>
#include<set>
#include<bitset>
#include<math.h>
#include<map>
#include<queue>
#include<iomanip>
using namespace std;
using ll = long long;

int main()
{
    string s, t;
    ll sum1 = 0, cnt = 0;
    vector<ll> v;
    cin >> s;
    for (int i = s.size() -1; i >= 0; i--){
        if (s[i] == 'c') v.push_back(cnt);
        if (s[i] == 'w') cnt++;
    }
    for (auto x : v){
        if (x >= 2) sum1 += x * (x- 1) / 2;
    }
    cout << sum1 << endl;
}