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#include<iostream>
#include<cstring>
#include<cmath>
#define ll long long
using namespace std;
int main ()
{
	ll a,c=0,w=0,p=0,l=0,x;
	char pom;

	cin>>a;
	for(int i=0;i<a;i++)
	{
	
	cin>>x;
	c+=x;
	}
	
	cin>>a;
	for(int i=0;i<a;i++)
	{
	cin>>pom;
		if(pom=='W')w++;else  p++;
	}
	
		if(w-p>=0)cout<<-1;
		else
		{
		
			while(c>0)
			{
				l++;
				c-=p;
			//	cout<<c<<endl;	
			}
			
			//cout<<endl<<endl<<l<<" "<<a<<endl; 
			if(c==0)cout<<l*a;
			else cout<<l*a+c;
		}
	
	
	return 0;
}