#include<iostream>
#include<string>
using namespace std;
int main(){
    string S;
    int wcount = 0;
    long long ans = 0;
    cin >> S;
    for(int i=S.length()-1;i>=0;i--){
        if(S[i] == 'w') wcount++;
        else if(S[i] == 'c'){
            ans += wcount*(wcount-1)/2;
        }
    }
    cout << ans << endl;
    return 0;
}