#include <bits/stdc++.h>
using namespace std;
long long ar[500005];
int main() {
  int n;
  scanf("%d", &n);
  for (int i = 0; i < n; i++) {
    scanf("%lld", &ar[i]);
  }
  string s;
  cin >> s;
  long long gain = 0;
  long long loss = 0;
  long long bob = 0;
  for (int i = 0; i < s.length(); i++) {
    if (s[i] == 'B') {
      bob += ar[i];
    }
  }
  long long ma = 0;
  for (int i = 0; i < s.length(); i++) {
    if (s[i] == 'A') {
      gain += ar[i];
    } else {
      loss += ar[i];
    }
    ma = max(ma, gain - loss);
  }
  gain = 0;
  loss = 0;
  for (int i = s.length() - 1; i >= 0; i--) {
    if (s[i] == 'A') {
      gain += ar[i];
    } else {
      loss += ar[i];
    }
    ma = max(ma, gain - loss);
  }
  bob += ma;
  printf("%lld", bob);
}
