import java.util.*;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
 
public class temp
{
	void solve()
	{
		FastReader sc =new FastReader();
		int n = sc.nextInt();
		int q = sc.nextInt();
		int f[] = new int[32];
		
		for(int i=0;i<n;i++)
		{
			int x = sc.nextInt();
			int temp = (int)(Math.log10(x)/Math.log10(2));
			f[temp]++;
		}
		
		while(q-->0)
		{
			int b = sc.nextInt();
			int max = (int)(Math.log10(b)/Math.log10(2)) + 1;
			
			int ans = 0;
			
			for(int i=max;i>=0;i--)
			{
				int num = (1<<i);
				if(num > b || f[i]==0)
					continue;
			
				int temp = b/num;
				b-=Math.min(temp,f[i])*num;
				ans++;
				
				if(b==0)
					break;
			}
			
			System.out.println(b!=0?"-1":ans);
		}
	}
 
    public static void main(String[] args)
    {
        new temp().solve();
    }
	
    static class FastReader
    {
        BufferedReader br;
        StringTokenizer st;
 
        public FastReader()
        {
            br = new BufferedReader(new
                     InputStreamReader(System.in));
        }
 
        String next()
        {
            while (st == null || !st.hasMoreElements())
            {
                try
                {
                    st = new StringTokenizer(br.readLine());
                }
                catch (IOException  e)
                {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }
 
        int nextInt()
        {
            return Integer.parseInt(next());
        }
 
        long nextLong()
        {
            return Long.parseLong(next());
        }
 
        double nextDouble()
        {
            return Double.parseDouble(next());
        }
 
        String nextLine()
        {
            String str = "";
            try
            {
                str = br.readLine();
            }
            catch (IOException e)
            {
                e.printStackTrace();
            }
            return str;
        }
    }
} 