#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<ll> VL;
typedef vector<VL> VVL;
typedef pair<int, int> PII;

#define FOR(i, a, n) for (ll i = (ll)a; i < (ll)n; ++i)
#define REP(i, n) FOR(i, 0, n)
#define ALL(x) x.begin(), x.end()
#define MOD 1000000007
#define INF (1LL<<25)     //33554432
#define PI 3.14159265359
#define EPS 1e-12
#define int ll

int t[100010];
signed main(void)
{
  string s;
  cin >> s;
  const int n = s.size();

  int a = 0;
  for(int i=n-1; i>=0; --i) {
    if(s[i] == 'w') a++;
    if(s[i] == 'c') t[i] = a;
  }
  ll ret = 0;
  REP(i, n) {
    // (t[i]) C (2)
    ret += t[i]*(t[i]-1)/2;
  }

  cout << ret << endl;
  return 0;
}