#include <stdio.h>

int main()
{
	int i, N, Q, A[101];
	scanf("%d %d", &N, &Q);
	for (i = 1; i <= N; i++) scanf("%d", &(A[i]));
	
	int j, k, x, sum[10001];
	for (i = 1, k = 1, sum[0] = 0; i <= N; i++) for (j = 1; j <= i; j++, k++) sum[k] = sum[k-1] + A[j];
	for (i = 1; i <= Q; i++) {
		scanf("%d", &x);
		for (j = 1; j < k; j++) if (sum[j] >= x) break;
		if (j < k) printf("%d\n", j);
		else printf("-1\n");
	}
	return 0;
}