import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.StringTokenizer;
import java.io.IOException;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.InputStream;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 *
 * @author programajor
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        TaskD solver = new TaskD();
        solver.solve(1, in, out);
        out.close();
    }

    static class TaskD {
        public void solve(int testNumber, InputReader in, PrintWriter out) {
            int n = in.nextInt();
            int q = in.nextInt();
            int[] frequency = new int[32];
            for (int i = 0; i < n; i++) {
                int coin = in.nextInt();
                frequency[(int) NumberTheory.logBase(coin, 2)]++;
            }

            for (int i = 0; i < q; i++) {
                int b = in.nextInt();
                int total = 0;
                for (int j = 31; j >= 0; j--) {
                    if (frequency[j] == 0) continue;
                    int consumed = Math.min(b / NumberTheory.twoPower(j), frequency[j]);
                    total += consumed;
                    b -= consumed * NumberTheory.twoPower(j);
                }
                if (b == 0) {
                    out.println(total);
                } else {
                    out.println(-1);
                }
            }

        }

    }

    static class NumberTheory {
        static int twoPower(int exponent) {
            return 1 << exponent;
        }

        static double logBase(double value, double base) {
            return Math.log(value) / Math.log(base);
        }

    }

    static class InputReader {
        private BufferedReader reader;
        private StringTokenizer tokenizer;

        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        }

        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }

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

    }
}

