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#include <cstdio>
using namespace std;

int n, m;
int* values;
char* code;
int* plusMinus;

int main() {
	scanf("%d", &n);
	values = new int[n];
	
	for(int i=0;i<n;i++) {
		scanf("%d", &values[i]);
	}
	scanf("%d", &m);
	
	code = new char[m];
	scanf("%s", code);
	
	plusMinus = new int[m];
	
	for(int i=0; i<m; i++) {
		if (code[i] == 'W') {
			plusMinus[i] = 1;
		}
		else {
			plusMinus[i] = -1;
		}
	}
	
	for (int i=0; i<n*m ; i++) {
		values[i%n] += plusMinus[i%m];
		if(values[i%n] == 0) {
			printf("%d\n", i+1);
			return 0;
		} 
	} 	
	
	printf("-1\n");
	
	return 0;
}