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#include <cstdio>

long long int n,m;
int T[1000010];
int P[1000010];
char c;

int main () {
  scanf("%lld", &n);
  for(int i=0;i<n;i++) {
    scanf("%d", &T[i]);
  }
  scanf("%lld", &m);
  scanf("%c", &c);
  for(int i=0;i<m;i++) {
    scanf("%c", &c);
    if(c == 'W') P[i] = 1;
    else P[i] = -1;
  }

  long long int k = 0;
  int a = 0;
  int b = 0;
  long long int inf = 100000000;
  while(true) {
    if(k > inf) {
      printf("-1\n");
      return 0;
    }
    k++;
    T[a] += P[b];
    if(T[a] == 0) {
      printf("%lld\n", k);
      return 0;
    }
    a++;b++;
    if(b == m)
      b = 0;
    if(a == n)
      a = 0;
  }
  return 0;
}