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

public class template {
	public static void main(String[] args) throws IOException {
		FastReader scan = new FastReader();
		//PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter("fpot.out")));
		PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));
		Task solver = new Task();
		//int t = scan.nextInt();
		int t = 1;
		for(int i = 1; i <= t; i++) solver.solve(i, scan, out);
		out.close();
	}
	static class Task {
		public void solve(int testNumber, FastReader sc, PrintWriter pw) {
			int c = sc.nextInt();
			int q = sc.nextInt();
			int[] cn = new int[31];
			for(int i=0;i<c;i++){
				int a = sc.nextInt();
				int ind = 0;
				while((a>>1)>0){
					a>>=1;
					ind++;
				}
				cn[ind]++;
			}
			for(int i = 0 ;i<q;i++){
				int qu = sc.nextInt();
				int ans = 0;
				for(int j=30;j>=0;j--){
					if(qu>(cn[j]*(1<<j))){
						qu-=cn[j]*(1<<j);
						ans+=cn[j];
					}
					else{
						ans+=qu/(1<<j);
						qu-=qu/(1<<j)*(1<<j);
					}
				}
				if(qu>0){
					ans=-1;
				}
				pw.println(ans);
			}
		}
	}
	static void shuffle(int[] a) {
		Random get = new Random();
		for (int i = 0; i < a.length; i++) {
			int r = get.nextInt(a.length);
			int temp = a[i];
			a[i] = a[r];
			a[r] = temp;
		}
	}

	static void shuffle(long[] a) {
		Random get = new Random();
		for (int i = 0; i < a.length; i++) {
			int r = get.nextInt(a.length);
			long temp = a[i];
			a[i] = a[r];
			a[r] = temp;
		}
	}
	static class FastReader {
		BufferedReader br;
		StringTokenizer st;

		public FastReader() {
			br = new BufferedReader(new InputStreamReader(System.in));
		}

		public FastReader(String s) throws FileNotFoundException {
			br = new BufferedReader(new FileReader(new File(s)));
		}

		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;
		}
	}

}