#include <bits/stdc++.h>
using namespace std;

#define REP(i,n) for(int i=0;i<n;i++)
#define rep(i,n) for(int i=0;i<n;i++)
#define INF INT_MAX/3
#define LINF LLONG_MAX/3
#define MP make_pair
#define PB push_back
#define EB emplace_back
#define ALL(v) (v).begin(),(v).end()
#define debug(x) cout<<#x<<":"<<x<<endl
#define debug2(x,y) cout<<#x<<","<<#y":"<<x<<","<<y<<endl
template<typename T>
ostream& operator<<(ostream& os,const vector<T>& vec){
    os << "[";
    for(const auto& v : vec){
        os << v << ",";
    }
    os << "]";
    return os;
}

typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> pii;
typedef vector<int> vi;
typedef vector<vi> vvi;

int main(){
    string s;cin>>s;
    int n=s.size();
    vector<int> memo(n+1,0);
    for(int i=n-1;i>=0;i--){
        if(s[i]=='w') memo[i] = memo[i+1]+1;
        else memo[i]=memo[i+1];
    }


    ll ans=0;
    for(int i=0;i<n;i++) if(s[i]=='c'){
        ans += (ll)memo[i]*(ll)(memo[i]-1)/2;
        assert(ans>=0);
    }
    cout << ans << endl;
}