
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.lang.reflect.Array;
import java.util.*;

public class T {

    public static void main(String[] args) throws IOException {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int q = sc.nextInt();
        int[] l = new int[33];
        for(int i=0;i<n;i++){
            int x = sc.nextInt();
            for (int j=0;j<33;j++)
                if ((x&(1<<j))!=0)
                    l[j] ++;
        }

        for (int k=0;k<q;k++){
            int in = sc.nextInt();
            int res = 0;
            int req = 0;
            for (int i=31;i>=0;i--){
                if (((1<<i)&in) !=0){
                    req++;
                }
                if (l[i] >=req){
                    res += req;
                    req = 0;
                }
                else{
                    res += l[i];
                    req -= l[i];
                }
                req *= 2;
            }
            if (req == 0)
                System.out.println(res);
            else
                System.out.println(-1);
        }




    }


}
