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#include <bits/stdc++.h>
using namespace std;

long long int NWD(long long int a,long long int b){
    while(b){
        long long int c=a%b;
        a=b;
        b=c;
    }
    return a;
}

char cycle[1000006];
long long int n,m;
long long int t[1000006];
long long int types;
long long int d;

long long int day=1000000000000000018LL;
int main(){

    ios::sync_with_stdio(0);
    cin>>n;
    for(long long int i=0;i<n;i++){
        cin>>t[i];
    }
    cin>>m;
    scanf("%s",cycle);

    long long int typ=NWD(n,m);
    for(long long int j=0;j<typ;j++){

        vector<char>vm;
        long long int sumak=0;
        for(long long int i=0;i<m;i+=typ){
                long long int temp=i+j;
            vm.push_back(cycle[temp]);
            sumak+=(cycle[temp]=='W')?1:-1;
        }

        vector<long long int>vn;
        for(long long int i=0;i<n;i+=typ){
            vn.push_back(i+j);
        }

    //    for(long long int i=0;i<vm.size();i++)cout<<vm[i]<<" ";
       // for(long long int i=0;i<vn.size();i++)cout<<vn[i]<<" ";

        //cout<<"---------"<<endl;

        long long int ma=1000000000000000018LL;
        long long int cday;
        bool was=false;

        for(long long int i=0;i<vn.size();i++){
            long long int c=vn[i];
            if(ma>=t[c]){
         //           cout<<ma;
                ma=t[c];
        //    cout<<"->"<<ma<<endl;
       //     cout<<i<<"cday"<<endl;
                cday=i;
            }
            ma=ma+((vm[i%vm.size()]=='W')?1:-1);
   // cout<<ma<<"ma"<<endl;

            if(ma<=0){
                long long int vnsz=vn.size();
                long long int temp=vnsz*(i-cday)+cday;
                long long int temp2=temp*typ+j;
                day=min(day, temp2 );
     //   cout<<day<<"day"<<endl;
                was=true;break;
            }
        }
        if(!was && sumak<0){
            long long int Ps=0;
            for(long long int i=cday;i<vm.size()+cday;i++){
                if(vm[i%vm.size()]=='W'){if(Ps<0)Ps++;}
                else Ps--;
            }


             long long int dd=(cday)*typ+j; long long int a=t[vn[cday]];
   // cout<<dd<<" "<<a<<" wombocombo";
   // cout<<Ps<<" -Ps   "<<sumak<<"sumaczek"<<endl;
    //cout<<vn.size()*vm.size()<<endl;
             while(a+Ps+sumak>0){
                    a=a+sumak;
                    long long int temp=(vn.size()*vm.size())*typ;
                    dd=dd+temp;
             }
             long long int i=cday;
             while(a>0){

   // cout<<vm[i%vm.size()]<<"::"<<endl;

                a=a+((vm[i%vm.size()]=='W')?1:-1);

   //             cout<<a<<" ***<<"<<dd<<endl;

                if(a>0){long long int temp=vn.size()*typ;dd=dd+temp;}

                i+=vn.size();
                i=i%vm.size();
             }
             day=min(day,dd);
        }



    }
    if(day==1000000000000000018LL)cout<<"-1"<<endl;
    else cout<<day+1<<endl;



    return 0;
}
/*

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PPPPPWPWW











*/