import java.io.*;
import java.util.*;

public class D {
	public static void main(String[] args) throws Throwable {
		Scanner sc = new Scanner(System.in);
		PrintWriter pw = new PrintWriter(System.out);

		int n = sc.nextInt();
		int q = sc.nextInt();
		int[] arr = new int[31];
		TreeMap<Integer, Integer> map = new TreeMap<>();
		map.put(1, 0);
		int bs = 1;
		for (int i = 0; 1l * bs * 2 <= 2e9; i++) {
			bs *= 2;
			map.put(bs, i + 1);
		}
		for (int i = 0; i < n; i++) {
			arr[map.get(sc.nextInt())]++;
		}
		while (q-- > 0) {
			int x = sc.nextInt();
			int ans = 0;
			for (int i = arr.length - 1; i >= 0; i--) {
				int now = 1 << i;
				int req = x / now;
				x -= Math.min(req, arr[i]) * now;
				ans += Math.min(req, arr[i]);
			}
			pw.println(x > 0 ? -1 : ans);
		}

		pw.flush();
		pw.close();
	}

	static void shuffle(int[] array) {
		int index;
		Random random = new Random();
		for (int i = array.length - 1; i > 0; i--) {
			index = random.nextInt(i + 1);
			if (index != i) {
				array[index] ^= array[i];
				array[i] ^= array[index];
				array[index] ^= array[i];
			}
		}
	}

	static class Scanner {
		StringTokenizer st;
		BufferedReader br;

		public Scanner(InputStream s) {
			br = new BufferedReader(new InputStreamReader(s));
		}

		public String next() throws IOException {
			while (st == null || !st.hasMoreTokens())
				st = new StringTokenizer(br.readLine());
			return st.nextToken();
		}

		public int nextInt() throws IOException {
			return Integer.parseInt(next());
		}

		public long nextLong() throws IOException {
			return Long.parseLong(next());
		}

		public String nextLine() throws IOException {
			return br.readLine();
		}

		public double nextDouble() throws IOException {
			return Double.parseDouble(next());
		}

		public boolean ready() throws IOException {
			return br.ready();
		}
	}
}