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#include <set>
#include <map>
#include <cmath>
#include <queue>
#include <stack>
#include <string>
#include <cstdio>
#include <vector>
#include <utility>
#include <cstdlib>
#include <iostream>
#include <algorithm>

#define ST first
#define ND second
#define MP make_pair
#define PB push_back
#define QI queue <int>
#define VI vector <int>
#define PII pair <int,int>
#define SZ(x) (int)(x).size()
#define ALL(x) x.begin(),x.end()
#define RALL(x) x.rbegin(),x.rend()
#define SYNC ios_base::sync_with_stdio(0)
#define MAX(a,b) ((a) > (b)) ? a : b

using namespace std;

typedef long long LL;
typedef long double LD;
typedef unsigned int UI;
typedef unsigned long long ULL;

const LL INF = 1e18 + 7;
const int ZERO = 1000005;

int a, b, c, d, e, f, n, m, k, nxt, sum, change, srodek = ZERO, bilans, lewo, prawo, last, first;
LL res = INF;

char Maszyna[1000005];
int Ciag[1000005];
int Money[1000005];
int Index[2000005];
int War[1000005];
bool Started[1000005];
bool Inside[1000005];

vector <int> Cycle;
vector <int> Same;
vector <int> Wyst[2000010];
queue <int> MemoryQ;

void StartSolve(int);
void Solve(int);
void CalcWyst();
void MoveIt(int);
void ClearShiet();

int main()
{
  scanf("%d", &n);
  for(int i = 1; i <= n; i++)
  {
    scanf("%d", &Money[i]);
  }
  scanf("%d", &m);
  scanf("%s", Maszyna);
  for(int i = 1; i <= m; i++)
  {
    Ciag[i] = (Maszyna[i - 1] == 'W') ? 1 : -1;
    bilans += Ciag[i];
  }
  nxt = n % m;
  for(int i = 1; i <= n; i++)
  {
    if(!Started[i])
    {
      StartSolve(i);
      CalcWyst();
      for(int j = 0; j < SZ(Cycle); j++)
      {
        Solve(Cycle[j]);
        MoveIt(Cycle[j]);
      }
      ClearShiet();
    }
  }
  printf("%lld\n", (res == INF) ? -1 : res);
}

void StartSolve(int x)
{
  int act = x;
  while(!Inside[act])
  {
    Inside[act] = true;
    Cycle.PB(act);
    act += nxt;
    if(act > m)
    {
      act -= m;
    }
  }
}

void CalcWyst()
{
  sum = first = lewo = prawo = last = 0;
  srodek = ZERO;
  for(int i = 0; i < SZ(Cycle); i++)
  {
    sum += Ciag[Cycle[i]];
    War[i] = sum;
    Wyst[srodek + sum].PB(last++);
    MemoryQ.push(srodek + sum);
    if(lewo == 0 && prawo == 0)
    {
      lewo = prawo = sum;
    }
    else
    {
      lewo = min(lewo, sum);
      prawo = max(prawo, sum);
    }
  }
  bilans = sum;
}

void Solve(int x)
{
  if(x <= n)
  {
    while(x <= n)
    {
      Started[x] = true;
      Same.PB(x);
      x += m;
    }
    while(!Same.empty())
    {
      int v = Same.back();
      Same.pop_back(); 
      LL wynik = 0;
      if(-lewo >= Money[v]) 
      {
        int duba = Wyst[srodek - Money[v]][Index[srodek - Money[v]]] - first + 1;
        wynik = (LL)n * (LL)(duba - 1) + (LL)v;
        res = min(res, wynik);
      }
      if(wynik == 0 && bilans < 0)
      {
        LL ile = (Money[v] + lewo - bilans - 1) / -bilans;
        LL zostalo = Money[v] + ile * bilans;
        int duba = Wyst[srodek - zostalo][Index[srodek - zostalo]] - first + 1;
        wynik = (LL)ile * (LL)SZ(Cycle) * (LL)n + (LL)n * (LL)(duba - 1) + (LL)v;
        res = min(res, wynik);
      }
    }
  }
}

void MoveIt(int x)
{
  Index[srodek + Ciag[x]]++;
  if(Index[srodek + Ciag[x]] == SZ(Wyst[srodek + Ciag[x]]))
  {
    if(Ciag[x] == -1)
    {
      if(lewo < 0 && prawo < 0)
      {
        prawo--;
      }
      else
      {
        lewo++;
      }
    }
    else
    {
      if(lewo > 0 && prawo > 0)
      {
        lewo++;
      }
      else
      {
        prawo--;
      }
    }
  }
  srodek += Ciag[x];
  lewo += -Ciag[x];
  prawo += -Ciag[x];
  lewo = min(lewo, 1);
  prawo = max(prawo, -1);
  Wyst[srodek + bilans].PB(last++);
  if(Index[srodek + bilans] == SZ(Wyst[srodek + bilans]) || SZ(Wyst[srodek + bilans]) == 1)
  {
    (bilans > 0) ? prawo++ : lewo--;
  }
  MemoryQ.push(srodek + bilans);
  first++;
}

void ClearShiet()
{
  Cycle.clear();
  while(!MemoryQ.empty())
  {
    Wyst[MemoryQ.front()].clear();
    Index[MemoryQ.front()] = 0;
    MemoryQ.pop();
  }
}