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#include <iostream>
#include <string.h>

using namespace std;

int main()
{
    long long int n,m,nww,a,b,c,iloczyn,powt,bil_counter=0;
    long long int gry=0;

    string cykl;
    //short int bilans[1000002];


    cin>>n;
    int *kasa=new int [n];
    int *bilans = new int [n];
    for(int i=0;i<n;i++)
    {
        cin>>kasa[i];
        bilans[i]=kasa[i];
    }


    cin>>m;
    cin>>cykl;

    int *cykl_num = new int [m];
    for(int i=0;i<m;i++)
    {
        if(cykl[i]=='W')
            cykl_num[i]=1;
        else
            cykl_num[i]=-1;
    }

    a=n;
    b=m;
    iloczyn=n*m;
    for(;b!=0;)
    {
        c=b;
        b=a%b;
        a=c;
    }

    nww=iloczyn/a;
    powt=nww/n;
    //cout<<powt;

    long long int index=0;
    for(long long int i=0;i<powt;i++)
    {
        for(int j=0;j<n;j++)
        {
            gry++;
            kasa[j]+=cykl_num[index%m];
            if(kasa[j]==0)
            {
                cout<<gry;
                return 0;
            }
            //cout<<kasa[j]<<" ";
            //cout<<index%m;
            index++;

        }
        //cout<<endl;
    }

    for(int j=0;j<n;j++)
    {
           bilans[j]=kasa[j]-bilans[j];

           if(bilans[j]<0)
           {
               //cout<<bilans[j]<<" ";
               break;
           }


           bil_counter++;
    }
    //cout<<endl;

    if(bil_counter==n)
    {
        cout<<-1;
        return 0;
    }
    else
    {
        for(;;)
        {
            for(int j=0;j<n;j++)
            {
                gry++;
                kasa[j]+=cykl_num[index%m];
                //cout<<kasa[j]<<" ";
                if(kasa[j]==0)
                {
                    //cout<<"kasa["<<j<<"]="<<kasa[j]<<endl;
                    cout<<gry;
                    return 0;
                }
                //cout<<index%m;
                index++;

            }
        }

    }

    delete[] cykl_num;
    delete[] kasa;
    delete[] bilans;

    return 0;
}