#include<iostream>
using namespace std;
int main(){
    string s;
    int w_cnt[100001]={};
    long long sum = 0;
    cin >> s;
    for(int i=s.size()-1;i>=0;i--){
        w_cnt[i]=w_cnt[i+1];
        if(s[i]=='w') w_cnt[i]++;
    }
    for(int i=0;i<s.size();i++){
        if(s[i]=='c'&&w_cnt[i]>=2){
            sum += ((w_cnt[i]-1)*(w_cnt[i]))/2;
        }
    }
    cout << sum << endl;
    
}