#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<n;i++)
using namespace std;
using ll =  long long ;
using P = pair<int,int> ;
const ll INF = 1e10;
const int MOD = 1000000007;

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