import java.io.DataInputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.*;

public class CF1003D {
    public static void main(String[] args) throws  Exception{
        Reader s = new Reader();
        int n = s.nextInt();
        int q = s.nextInt();
        long[] arr = new long[n];
        TreeMap<Long,Integer> map = new TreeMap<>();
        for (int i = 0; i < n; i++) {
            arr[i] = s.nextInt();
            map.put(arr[i],map.getOrDefault(arr[i],0) + 1);
        }
        int[] queries = new int[q];
        for (int i = 0; i < q; i++) {
            queries[i] = s.nextInt();
        }
        ArrayList<Long> list = new ArrayList<>(map.keySet());
        for (int i = 0; i < q; i++) {
            int j = list.size() - 1;
            int m = queries[i];
            long ans  = 0;
            while(j >= 0 && m > 0){
                long larg = list.get(j);
                int freq = map.get(larg);
                if(larg * freq <= m){
                    m -= larg * freq;
                    ans += freq;
                    j--;
                }else{
                    if(larg > m){
                        j--;
                    }else{
                        long quo = m/larg;
                        m %= larg;
                        ans += quo;
                    }
                }
            }
            if(m == 0){
                System.out.println(ans);
            }else{
                System.out.println(-1);
            }
        }

    }
}
class Reader
{
    final private int BUFFER_SIZE = 1 << 16;
    private DataInputStream din;
    private byte[] buffer;
    private int bufferPointer, bytesRead;

    public Reader()
    {
        din = new DataInputStream(System.in);
        buffer = new byte[BUFFER_SIZE];
        bufferPointer = bytesRead = 0;
    }

    public Reader(String file_name) throws IOException
    {
        din = new DataInputStream(new FileInputStream(file_name));
        buffer = new byte[BUFFER_SIZE];
        bufferPointer = bytesRead = 0;
    }

    public String readLine() throws IOException
    {
        byte[] buf = new byte[64]; // line length
        int cnt = 0, c;
        while ((c = read()) != -1)
        {
            if (c == '\n')
                break;
            buf[cnt++] = (byte) c;
        }
        return new String(buf, 0, cnt);
    }

    public int nextInt() throws IOException
    {
        int ret = 0;
        byte c = read();
        while (c <= ' ')
            c = read();
        boolean neg = (c == '-');
        if (neg)
            c = read();
        do
        {
            ret = ret * 10 + c - '0';
        }  while ((c = read()) >= '0' && c <= '9');

        if (neg)
            return -ret;
        return ret;
    }

    public long nextLong() throws IOException
    {
        long ret = 0;
        byte c = read();
        while (c <= ' ')
            c = read();
        boolean neg = (c == '-');
        if (neg)
            c = read();
        do {
            ret = ret * 10 + c - '0';
        }
        while ((c = read()) >= '0' && c <= '9');
        if (neg)
            return -ret;
        return ret;
    }

    public double nextDouble() throws IOException
    {
        double ret = 0, div = 1;
        byte c = read();
        while (c <= ' ')
            c = read();
        boolean neg = (c == '-');
        if (neg)
            c = read();

        do {
            ret = ret * 10 + c - '0';
        }
        while ((c = read()) >= '0' && c <= '9');

        if (c == '.')
        {
            while ((c = read()) >= '0' && c <= '9')
            {
                ret += (c - '0') / (div *= 10);
            }
        }

        if (neg)
            return -ret;
        return ret;
    }

    private void fillBuffer() throws IOException
    {
        bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);
        if (bytesRead == -1)
            buffer[0] = -1;
    }

    private byte read() throws IOException
    {
        if (bufferPointer == bytesRead)
            fillBuffer();
        return buffer[bufferPointer++];
    }

    public void close() throws IOException
    {
        if (din == null)
            return;
        din.close();
    }
}
