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#include <cstdio>
#include <vector>
#include <queue>
#include <set>
#include <map>
#include <algorithm>

using namespace std;
using llu = unsigned long long;

struct Coleague
{
	Coleague()
		: cycle_id(-1)
		, offset(-1)
		, id(-1)
		, rounds(-1)
	{}

	int id;
	int value;
	int cycle_id;
	int offset;
	llu rounds;
};

struct Cycle
{
	vector<short> values;
	vector<int> minSums;
	vector<int> prefSum;
	//map<int, vector<int>> sum_locations;
	int sum;

	int size()
	{
		return values.size() / 2;
	}
};

vector<Cycle> cycles;
vector<Coleague> col;
vector<short> cycle;

void clone(int src, int dest)
{
	col[dest].cycle_id = col[src].cycle_id;
	col[dest].offset = col[src].offset;
}

int main()
{
	int n, m;
	scanf("%d", &n);
	col.resize(n);

	for (int i = 0; i < n; ++i)
	{
		scanf("%d", &col[i].value);
		col[i].id = i;
		col[i].rounds = i + 1;
	}

	scanf("%d", &m);
	char* str = new char[m + 10];
	scanf("%s", str);

	cycle.reserve(m);
	for (int i = 0; i < m; ++i)
	{
		if (str[i] == 'W')
			cycle.push_back(1);
		else
			cycle.push_back(-1);
	}
	delete[] str;

	cycles.reserve(n);
	for (int i = 0; i < col.size(); ++i)
	{

		if (col[i].cycle_id != -1)
			continue;

		if (i >= m)
		{
			clone(i % m, i);
			continue;
		}

		int index = cycles.size();
		cycles.push_back(Cycle());
		Cycle& current = cycles[index];

		int id = i;
		int off = 0;
		do
		{
			if (id < col.size())
			{
				col[id].cycle_id = index;
				col[id].offset = off;
			}
			++off;
			current.values.push_back(cycle[id]);
			id = (id + n) % m;
		} while (id != i);
	}

	//zwieksz kazdy wektor dwukrotnie
	for (int i = 0; i < cycles.size(); ++i)
	{
		auto tmp = cycles[i].values;
		cycles[i].values.insert(cycles[i].values.end(), tmp.begin(), tmp.end());
	}

	//wyszukaj minimalne prefiksy
	for (int i = 0; i < cycles.size(); ++i)
	{
		auto& cycle = cycles[i];
		int sum = 0;
		int min_sum = 0;
		cycle.prefSum.reserve(cycle.size() * 2);

		int total = 0;
		for (int j = 0; j < cycle.size() * 2; ++j)
		{
			total += cycle.values[j];
			cycle.prefSum.push_back(total);
			//cycle.sum_locations[total].push_back(j);
		}

		for (int j = 0; j < cycle.size(); ++j)
		{
			sum += cycle.values[j];
			min_sum = min(min_sum, sum);
		}

		cycle.sum = sum;
		cycle.minSums.push_back(min_sum);
		for (int j = 1; j < cycle.size(); ++j) //not siur
		{
			int a = min_sum - cycle.values[j - 1];
			min_sum = min(a, sum);
			cycle.minSums.push_back(min_sum);
		}
	}


	//policz dla kazdego w ktorej rundzie skonczy

	llu max_pos_value = std::numeric_limits<llu>::max();
	llu minimum = std::numeric_limits<llu>::max();
	vector<int> possibles;
	vector<int> first_round;
	bool possible = false;
	for (int i = 0; i < col.size(); ++i)
	{
		int cyc = col[i].cycle_id;
		int off = col[i].offset;
		int value = col[i].value;

		int min_sum = cycles[cyc].minSums[off];
		int sum = cycles[cyc].sum;

		if (value + min_sum <= 0)
		{
			first_round.push_back(i);
			possibles.push_back(i);
			max_pos_value = std::min(max_pos_value, col[i].rounds + (llu)col.size() * (llu)cycles[cyc].size());
			possible = true;
		}
		else if (sum < 0)
		{
			int to_eat = value - abs(min_sum);
			llu whole_rounds = std::ceil((double)to_eat / (double)abs(sum));
			col[i].value = value - whole_rounds * abs(sum);
			col[i].rounds += whole_rounds * (llu)col.size() * (llu)cycles[cyc].size();
			possibles.push_back(i);
			possible = true;
			minimum = min(col[i].rounds, minimum);
			max_pos_value = std::min(max_pos_value, col[i].rounds + (llu)col.size() * (llu)cycles[cyc].size());
		}
	}

	if (!possible)
	{
		puts("-1");
		return 0;
	}

	vector<int> possibles_processed;
	for (int i = 0; i < possibles.size(); ++i)
	{
		auto c = col[possibles[i]];

		if (c.rounds < max_pos_value)
			possibles_processed.push_back(possibles[i]);
	}

	llu result = std::numeric_limits<llu>::max();
	for (int i = 0; i < possibles_processed.size(); ++i)
	{
		auto& c = col[possibles_processed[i]];
		auto& cycle = cycles[c.cycle_id];

		for (int j = c.offset; j < c.offset + cycle.size() * 2; ++j)
		{
			c.value += cycle.values[j % cycle.size()];

			if (c.value == 0)
			{
				result = min(result, c.rounds);
				break;
			}

			c.rounds += (llu)col.size(); // idz do kolejki
		}
	}

	printf("%llu\n", result);

	return 0;
}