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#include<iostream>

using namespace std;

int main()
{
  long long n, m, counter, odd, i;
  int cash[1000000];
  int game[1000000];
  char a;
  counter = 0;
  cin >> n;
  for( i = 0; i < n; i++)
  {
      cin >> cash[i];      
  }
  cin >> m;
  for( i = 0; i < m; i++)
  {
      cin >> a;   
	  if (a == 'W')
		game[i] = 1;
	  else
	    game[i] = -1;
  }
  odd = 1;
  do
  {
	  for( i = 0; i < m; i++)
	  {
	    cash[counter % n] += game[i];		
		counter++;
		if (cash[(counter-1) % n] == 0) 
		{
		 cout << counter;
		 odd = 0;
		 break;
		}
	  }
	  if (counter > 223372036854775807)
	  {
	     counter = -1;
	     cout << counter;
		 odd = 0;
		 break;
	  }
  }while(odd != 0);
  return 0;
}