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

public class Lab3 {

    static class InputReader
	{
	    private final InputStream stream;
	    private final byte[] buf = new byte[8192];
	    private int curChar, snumChars;

	    public InputReader(InputStream st) {
	      this.stream = st;
	    }

	    public int read() {
	      if (snumChars == -1)
	        throw new InputMismatchException();
	      if (curChar >= snumChars) {
	        curChar = 0;
	        try {
	          snumChars = stream.read(buf);
	        } catch (IOException e) {
	          throw new InputMismatchException();
	        }
	        if (snumChars <= 0)
	          return -1;
	      }
	      return buf[curChar++];
	    }

	    public int nextInt() {
	      int c = read();
	      while (isSpaceChar(c)) {
	        c = read();
	      }
	      int sgn = 1;
	      if (c == '-') {
	        sgn = -1;
	        c = read();
	      }
	      int res = 0;
	      do {
	        res *= 10;
	        res += c - '0';
	        c = read();
	      } while (!isSpaceChar(c));
	      return res * sgn;
	    }

	    public long nextLong() {
	      int c = read();
	      while (isSpaceChar(c)) {
	        c = read();
	      }
	      int sgn = 1;
	      if (c == '-') {
	        sgn = -1;
	        c = read();
	      }
	      long res = 0;
	      do {
	        res *= 10;
	        res += c - '0';
	        c = read();
	      } while (!isSpaceChar(c));
	      return res * sgn;
	    }

	    public int[] nextIntArray(int n) {
	      int a[] = new int[n];
	      for (int i = 0; i < n; i++) {
	        a[i] = nextInt();
	      }
	      return a;
	    }

	    public String readString() {
	      int c = read();
	      while (isSpaceChar(c)) {
	        c = read();
	      }
	      StringBuilder res = new StringBuilder();
	      do {
	        res.appendCodePoint(c);
	        c = read();
	      } while (!isSpaceChar(c));
	      return res.toString();
	    }

	    public String nextLine() {
	      int c = read();
	      while (isSpaceChar(c))
	        c = read();
	      StringBuilder res = new StringBuilder();
	      do {
	        res.appendCodePoint(c);
	        c = read();
	      } while (!isEndOfLine(c));
	      return res.toString();
	    }

	    public boolean isSpaceChar(int c) {
	      return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
	    }

	    private boolean isEndOfLine(int c) {
	      return c == '\n' || c == '\r' || c == -1;
	    }
	}
	public static void main(String[] args) throws Exception
	{
		InputReader in = new InputReader(System.in);
		int n = in.nextInt();
		int q = in.nextInt();
		int[] arr = new int[n];
		HashMap<Integer,Integer> map = new HashMap<>();
		PriorityQueue<Integer> pq = new PriorityQueue<Integer>(new Comparator<Integer>(){
			public int compare(Integer a,Integer b)
			{
				return b - a;
			}
		});
		PriorityQueue<Integer> pq1 = new PriorityQueue<Integer>(new Comparator<Integer>(){
			public int compare(Integer a,Integer b)
			{
				return b - a;
			}
		});
		for(int i=0;i<n;i++)
		{
			arr[i] = in.nextInt();
			if(map.get(arr[i]) == null)
			{
				map.put(arr[i],1);
				pq.add(arr[i]);
				pq1.add(arr[i]);
			}
			else
			{
				int g = map.get(arr[i]);
				map.put(arr[i],++g);
			}
		}
		for(int i=0;i<q;i++)
		{
			int temp = in.nextInt();
			int count = 0;
			while(temp > 0 && !pq.isEmpty())
			{
				int a = pq.remove();
				int s = temp/a;
				int g = map.get(a);
                                if(a > temp)
                                    continue;
				if(g <= s)
				{
					temp = temp - a*g;
					count = count + g;
				}
				else if(g > s)
				{
					temp = temp - s*a;
					count = count + s;
				}
			}
			if(temp != 0)
				System.out.println("-1");
			else
				System.out.println(count);
			pq = new PriorityQueue<Integer>(pq1);
		}
	}


}
