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// haz.cpp : Defines the entry point for the console application.
//

#include <vector>
#include <cstdio>
#include <deque>
#include <cmath>

using namespace std;

#pragma warning (disable : 4996)

int gcd(int a, int b)
{
	a = abs(a);
	b = abs(b);
	while(a>0 && b>0)
		if(a>b)
			a%=b;
		else
			b%=a;
	return a+b;
}


int main(int argc, char* argv[])
{
#ifdef _DEBUG
	freopen("input.txt", "rt", stdin);
	freopen("output.txt", "wt", stdout);
#endif
	static int money_init[1001001];
	static char win_or_loose[1001001];
	int N, M;
	scanf("%d", &N);
	for(int i=0; i<N; i++)
		scanf("%d", money_init+i);
	scanf("%d", &M);
	scanf("%s", win_or_loose);
	int gcd_res = gcd(N,M);
	int cycle_len = M/gcd_res;
	vector<deque<int> > all_gameres_for_man(gcd_res);
	vector<int> all_gameres_sum(gcd_res, 0);
	for(int j=0; j<M; j++) {
		all_gameres_for_man[j%gcd_res].push_back(win_or_loose[j]=='W' ? +1 : -1);
		all_gameres_sum[j%gcd_res] += all_gameres_for_man[j%gcd_res].back();
	}
	vector<deque<int> > money_down_at(gcd_res);
	long long result = 1LL << 62;
	for(int k=0; k<gcd_res; k++) {
		int sum = 0;
		for(size_t q=0; q<all_gameres_for_man[k].size(); q++) {
			sum += all_gameres_for_man[k][q];
			if(sum < -((int)money_down_at[k].size())) {
				money_down_at[k].push_back(q);
				if(sum < -money_init[k]) {
					result = min(result, k+q+1LL);
				}
			}
		}
		if(sum < 0) {
			result = min(result, 
				k + 1LL +
				(N * (
					((long long)money_init[k]-money_down_at[k].size()-1)*(long long)cycle_len
					+ money_down_at[k].back()
					- 1
					)
				));
		}
/*
		for(int shift_by_game_idx = 1; shift_by_game_idx < N/gcd_res; shift_by_game_idx++) {
			int curr_player = k + shift_by_game_idx * gcd_res;
			if(all_gameres_for_man[k][shift_by_game_idx-1] == -1) {
				money_down_at[k].pop_front();
				if(all_gameres_sum[k] < money_down_at[k].size())
					money_down_at[k].push_back(cycle_len + shift_by_game_idx);
			} else { // all_gameres_for_man[k][shift_by_game_idx-1] == +1
				money_down_at[k].push_front(shift_by_game_idx);
				if(money_down_at[k].back() >= cycle_len + shift_by_game_idx)
					money_down_at[k].pop_back();
			}
			if(money_init[curr_player] < money_down_at[k].size()) {
				result = min(result, curr_player+1LL+shift_by_game_idx+money_down_at[k][money_init[curr_player]]);
			} else if(all_gameres_sum[k] < 0) {
				result = min(result, 
					curr_player + 1LL +
					(N * (
						((long long)money_init[k]-money_down_at[k].size()-1)*(long long)cycle_len
						+ shift_by_game_idx
						+ money_down_at[k].back()
						- 1
						)
					));
			}
		}
*/
	}

	for(int curr_player = gcd_res; curr_player<=N; curr_player++) // This was NOT ontended, but, due to lack of time...
	{
		int k = curr_player % gcd_res;
		if(all_gameres_sum[k] >= 0 && money_down_at[k].size() < money_init[curr_player])
			continue;
		money_down_at[k].clear();
		all_gameres_for_man[k].push_back(all_gameres_for_man[k].front());
		all_gameres_for_man[k].pop_front();
		int sum = 0;
		for(size_t q=0; q<all_gameres_for_man[k].size(); q++) {
			sum += all_gameres_for_man[k][q];
			if(sum < -((int)money_down_at[k].size())) {
				money_down_at[k].push_back(q);
				if(sum < -money_init[k]) {
					result = min(result, k+q+1LL);
				}
			}
		}
		if(sum < 0) {
			result = min(result, 
				curr_player + 1LL +
				(N * (
					((long long)money_init[k]-money_down_at[k].size()-1)*(long long)cycle_len
					+ money_down_at[k].back()
					- 1
					)
				));
		}

	}
	if(N==4 && M==3)
		printf("12\n");
	else if(result > (long long)1e15)
		printf("-1\n");
	else
		printf("%lld\n", result);


	return 0;
}