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#include <algorithm>
#include <cstdio>

using namespace std;

typedef long long ll;

int main() {
	int n;
	scanf("%d", &n)?:0;
	int cash[n];
	for(int i = 0; i < n; i++)
		scanf("%d", &cash[i])?:0;
	int m;
	scanf("%d", &m)?:0;
	bool cycle[m];
	for(int i = 0; i < m; i++) {
		char tmp;
		scanf(" %c", &tmp)?:0;
		cycle[i] = (tmp=='W')?true:false;
	}
	ll res = 2*(1e18);
	for(int i = 0; i < n; i++) {
		//printf("%d\n", i);
		//printf("i = %d\n", i);
		ll pos = i%m, curr = cash[i], played = 0, min_cash = cash[i]+2, min_cash_played = -1;
		do {
			//printf("pos = %d\n", pos);
			curr += (cycle[pos])?1:(-1);
			//printf("pos = %lld, curr = %lld\n", pos, curr);
			played++;
			//printf("\tplayed = %lld\n", played);
			if(curr < min_cash) {
				min_cash = curr;
				min_cash_played = played;
			}
			if(curr == 0)
				break;
			pos = (pos+n)%m;
		} while(pos != i%m /*&& played < res*/);
		if(curr == 0) {
			res = min(res, played*n-(n-i-1));
			//printf("a %lld\n", played*n-(n-i-1));
			continue;
		}
		ll cycle_diff = curr-cash[i], min_cash_diff = min_cash-cash[i];
		//printf("cycle_diff = %lld\n", cycle_diff);
		if(cycle_diff < 0) {
			if(curr+min_cash_diff >= 0) {
				//puts("b");
				played *= -((curr+min_cash_diff)/cycle_diff)+1;
				curr += (-((curr+min_cash_diff)/cycle_diff))*cycle_diff;
			}
			else {
				//printf("cc %lld %lld\n", -(curr/cycle_diff), min_cash_diff);
				played *= -(curr/cycle_diff)+1;
				curr += (-(curr/cycle_diff))*cycle_diff;
			}
			while(curr != 0 /*&& played < res*/) {
				//puts("druga petla");
				curr += (cycle[pos])?1:(-1);
				played++;
				pos = (pos+n)%m;
			}
			res = min(res, played*n-(n-i-1));
			//printf("%lld\n", played*n-(n-i-1));
		}
		//puts("jestem");
		//printf("played = %lld, i = %d\n", played, i);
	}
	//puts("wtf");
	if(res == 2*(1e18))
		puts("-1");
	else
		printf("%lld\n", res);
	return 0;
}

/*
4
2 3 2 1
3
WPP
*/