import java.awt.List;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.math.BigDecimal;
import java.math.RoundingMode;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.Scanner;
import java.util.StringTokenizer;


public class main {
	
	static long d,x,y;
	
	public static void main(String[] args) {
		FastScanner in = new FastScanner();
		
		int n = in.nextInt(), q = in.nextInt();
		
		long arr[] = new long[n];
		int frq[] = new int[32];
		
		HashSet<Long> hs = new HashSet();
		
		for (int i=0; i<n; i++){
			arr[i] = in.nextLong();
			hs.add(arr[i]);
			
			frq[(int) (Math.log((double)arr[i])/Math.log(2))]++;
		}
		
		StringBuilder sb = new StringBuilder();
		
		for (int i=0; i<q; i++){
			int num = in.nextInt();
			int ans = 0;
			
			for(int j=31; j>=0; j--){
				int count = Math.min(num/(1<<(j)), frq[j]);
				ans += count;
				
				num -= count*(1<<(j));
				
				if(num==0) break;
			}
			
			if(num==0) sb.append(ans+"\n");
			else sb.append("-1\n");
		}
		
		System.out.println(sb);
		
	}

}










class FastScanner {
	BufferedReader br;
	StringTokenizer st;
	
	public FastScanner() {
		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());
	}
}
