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#include<bits/stdc++.h>
#define PII pair<int,int>
#define f first
#define s second
#define VI vector<int>
#define LL long long
#define MP make_pair
#define LD long double
#define PB push_back
#define ALL(V) V.begin(),V.end()
#define abs(x) max((x),-(x))
#define PDD pair<LD,LD> 
#define VPII vector< PII > 
#define siz(V) ((int)V.size())
#define FOR(x, b, e)  for(int x=b;x<=(e);x++)
#define FORD(x, b, e) for(int x=b;x>=(e);x--)
#define REP(x, n)     for(int x=0;x<(n);x++)
#define mini(a,b) a=min(a,b)
#define maxi(a,b) a=max(a,b)
using namespace std;
int n,m;
const int MXN=1e6+6;
int in[MXN];
char inn[MXN];
int ID=1;
int idincycle[MXN];
int nrincycle[MXN];
int idtree=1;

namespace tree
	{
	const int BASE=1<<21;
	int t[BASE*2];
	void init()
		{
		REP(i,BASE*2)t[i]=1e9;
		}
	void lazyinsert(int x,int v)
		{
		t[x+BASE]=v;
		}
	void calc()
		{
		FORD(i,BASE-1,1)
			t[i]=min(t[i*2], t[i*2+1]);
		}
	void insert(int x,int v)
		{
		x+=BASE;
		while(x)
			{
			mini(t[x],v);
			x/=2;
			}
		}
	int query(int a,int b)
		{
		a+=BASE-1;
		b+=BASE+1;
		int r=1e9;
		while((a>>1)!=(b>>1))
			{
			if((a&1)==0)mini(r,t[a+1]);
			if(b&1)mini(r,t[b-1]);
			a>>=1;
			b>>=1;
			}
		return r;
		}
	int query2(int p,int x)
		{
		p+=BASE;
		if(t[p]<=x)return 0;
		int pocp=p;
		while(p)
			{
			if((p&1)==0 && t[p+1]<=x)
				{
				p++;
				break;
				}
			p>>=1;
			}
		while(p<BASE)
			{
			if(t[p<<1]<=x)p<<=1;
			else p=(p<<1)+1;
			}
		return p-pocp;
		}
	}

struct cycle
	{
	int sum;
	int siz;
	int poctree;
	int firstel;
	int query(int a,int b)
		{
		return tree::query(a+poctree,b+poctree);
		}
	int query2(int a,int v)
		{
		return tree::query2(a+poctree,v);
		}
	} t[MXN];
void readint(int &a)
  {
  char ch=0;
  a=0;
  while(ch<33)ch=getchar_unlocked();
  do
    {
    a=(a<<1)+(a<<3)+ch-'0';
    ch=getchar_unlocked();
    }
  while(ch>33);
  }
main()
{
tree::init();
scanf("%d",&n);
REP(i,n)
	{
	readint(in[i]);
	}
scanf("%d",&m);
scanf("%s",inn);

REP(i,m)
	{
	if(idincycle[i])continue;
	int sum=0;
	int nr=0;
	int x=i;
	do
		{
		idincycle[x]=ID;
		nrincycle[x]=nr++;
		sum+=(inn[x]=='W')*2-1;
		x=(x+n)%m;
		}
	while(x!=i);
	t[ID].sum=sum;
	t[ID].siz=nr;
	t[ID].poctree=idtree;
	t[ID].firstel=i;
	idtree+=t[ID].siz*2;
	ID++;
	}
ID--;
//cerr<<"CYKLI: "<<ID<<endl;
FOR(i,1,ID)
	{
	int poc=t[i].poctree;
	int w=t[i].firstel;
	int sum=0;
	REP(u,t[i].siz*2)
		{
		sum+=(inn[w]=='W')*2-1;
		tree::lazyinsert(poc+u,sum);
		w+=n;
		w%=m;
		}
	}
tree::calc();
LL res=1e18;
res++;
REP(XX,n)
	{
	int i=XX%m;
	int razy=0;
	LL value=in[XX];
	int id=idincycle[i];
	int warini=t[id].query(nrincycle[i],nrincycle[i])-((inn[i]=='W')*2-1);
	value-=warini;
//	cerr<<XX<<" "<<i<<" v: "<<value<<" "<<warini<<" "<<t[id].sum<<endl;
	value+=t[id].query(nrincycle[i],nrincycle[i]+t[id].siz-1);
	
//	cerr<<"po: "<<value<<endl;
	if(value<=0)razy=0;
	else
		{
		if(t[id].sum>=0)continue;
		razy=value/(-t[id].sum)+(value%(-t[id].sum)>0);
		}
	if((LL)razy*n*t[id].siz-n>res)continue;
	value=in[XX]+razy*t[id].sum;
//	cerr<<XX<<" uu "<<value<<endl;
	int iledalej=0;
	iledalej=t[id].query2(nrincycle[i],warini-value)+1;
	
	LL resnow=(LL)razy*n*t[id].siz+(LL)n*(iledalej)-n+XX+1;
//	cerr<<XX<<" razy: "<<razy<<" iledalej: "<<iledalej<<" res i :"<<resnow<<endl;
	mini(res,resnow);
	}
if(res>(LL)1e18)
	{
	puts("-1");
	return 0;
	}
printf("%lld\n",res);
}