#include <bits/stdc++.h>
#define FOR(i,a,b) for (int i=(a);i<(b);i++)
#define FORR(i,a,b) for (int i=(a);i>=(b);i--)
#define pb push_back

using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
typedef vector<int> vi;
typedef set<int> si;
const int inf = 1e9;
const int mod = 1e9+7;

ll c, cw, cww;
string s;
main(){
  cin.tie(0);
  ios::sync_with_stdio(false);
  cin >> s;
  FOR(i, 0, s.size()){
    switch(s[i]){
      case 'c':
        c++;
        break;
      case 'w':
        cww += cw;
        cw += c;
        break;
      default:
        break;
    }
  }
  cout << cww << endl;
}