import java.io.*;
import java.math.BigInteger;
import java.util.*;



public class  gym{
    public static void main(String[] args) throws IOException{
        MScanner sc = new MScanner(System.in);
        PrintWriter pw=new PrintWriter(System.out);
        int n=sc.nextInt();
        int q=sc.nextInt();
        int[]two=new int[31];
        for(int i=0;i<n;i++) {
        	int pow=0;
        	int x=sc.nextInt();
        	while(x>1) {
        		x/=2;pow++;
        	}
        	two[pow]++;
        }
        for(int i=0;i<q;i++) {
        	int ans=0;
        	char[]b=Integer.toBinaryString(sc.nextInt()).toCharArray();
        	int pow=0;boolean yes=true;
        	for(int j=b.length-1;j>=0;j--) {
        		if(b[j]=='1') {
        			int count=1;
        			int p=pow;
        			while(p>=0) {
        				if(two[p]>=count) {
        					ans+=count;break;
        				}
        				p--;count*=2;
        			}
        			if(p<0) {
        				pw.println(-1);yes=false;break;
        			}
        		}
        		pow++;
        	}
        	if(yes)
        		pw.println(ans);
        }
        pw.flush();
    }
    
    
	static class MScanner 
	{
	    StringTokenizer st;
	    BufferedReader br;

	    public MScanner(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
	    {
	        String x = next();
	        StringBuilder sb = new StringBuilder("0");
	        double res = 0, f = 1;
	        boolean dec = false, neg = false;
	        int start = 0;
	        if(x.charAt(0) == '-')
	        {
	            neg = true;
	            start++;
	        }
	        for(int i = start; i < x.length(); i++)
	            if(x.charAt(i) == '.')
	            {
	                res = Long.parseLong(sb.toString());
	                sb = new StringBuilder("0");
	                dec = true;
	            }
	            else
	            {
	                sb.append(x.charAt(i));
	                if(dec)
	                    f *= 10;
	            }
	        res += Long.parseLong(sb.toString()) / f;
	        return res * (neg?-1:1);
	    }
	    
	    public boolean ready() throws IOException {return br.ready();}


	}
}