#include <iostream>
#include <string>
using namespace std;

#define FOR(i,a,b) for (int i=(a);i<(b);i++)
#define FORR(i,a,b) for (int i=(b)-1;i>=(a);i--)
#define REP(i,n) for (int i=0;i<(n);i++)
#define RREP(i,n) for (int i=(n)-1;i>=0;i--)
#define pb push_back
#define ALL(a) (a).begin(),(a).end()

typedef long long ll;

int main() {
    string S;
    cin >> S;
    ll sm = 0;
    ll w = 0;
    RREP(i, S.length()) {
        if (S[i] == 'w') {
            w++;
        }
        if (S[i] == 'c') {
            sm += w * (w - 1) / 2;
        }
    }
    cout << sm << endl;
    return 0;
}