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#include <iostream>
#include <cstdio>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <vector>

using namespace std;

int main(){

	int n;
	scanf("%d", &n);

	vector<int> money;
	for(int i = 0; i < n; ++i){
		int k;
		scanf("%d", &k);
		money.push_back(k);
	}

	int m;
	scanf("%d", &m);

	char *string = new char[m];
	scanf("%s", string);

	int a = 0;
	int b = 0;
	for(unsigned long long result = 1; result < 100000000; ++result){
		if(string[a] == 'W'){
			money[b] = money[b] + 1;
		}

		if(string[a] == 'P'){
			money[b] = money[b] - 1;
		}

		if(money[b] == 0){
			printf("%llu ", result);
			return 0;
		}

		++a;
		++b;
		if(a == m){
			a = 0;
		}

		if(b == n){
			b = 0;
		}
	}
	a = -1;
	printf("%d", a);
	return 0;


}