import java.io.IOException;
import java.io.InputStream;
import java.util.InputMismatchException;
public class D494 {

	public static void main(String[] args) {
		FastScanner in = new FastScanner(System.in);
		int N = in.nextInt();
		int Q = in.nextInt();
		
		int[] arr = new int[33];
		
		for(int i = 0; i < N; i++) {
			int money = in.nextInt();
			int count = 0;
			while(money > 1) {
				money /= 2;
				count++;
			}
			
			arr[count]++;
		}
		
		StringBuilder sb = new StringBuilder();
		for(int q = 0; q < Q; q++) {
			int total = in.nextInt();
			int result = 0;
			
			for(int i = arr.length-1; i >= 0; i--) {
				if(arr[i] == 0) continue;
				int money = (1 << i);
				
				int quotient = Math.min(total / money, arr[i]);
				int remainder = total - quotient * money;
				
				total = remainder;
				result += quotient;
			}
			
			if(result == 0 || total != 0)
				result = -1;
			
			sb.append(result);
			sb.append("\n");
		}
		
		System.out.println(sb.toString());
	}
	
	/**
	 * Source: Matt Fontaine
	 */
	static class FastScanner {
		private InputStream stream;
		private byte[] buf = new byte[1024];
		private int curChar;
		private int chars;

		public FastScanner(InputStream stream) {
			this.stream = stream;
		}

		int read() {
			if (chars == -1)
				throw new InputMismatchException();
			if (curChar >= chars) {
				curChar = 0;
				try {
					chars = stream.read(buf);
				} catch (IOException e) {
					throw new InputMismatchException();
				}
				if (chars <= 0)
					return -1;
			}
			return buf[curChar++];
		}

		boolean isSpaceChar(int c) {
			return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
		}

		boolean isEndline(int c) {
			return c == '\n' || c == '\r' || c == -1;
		}

		public int nextInt() {
			return Integer.parseInt(next());
		}

		public long nextLong() {
			return Long.parseLong(next());
		}

		public double nextDouble() {
			return Double.parseDouble(next());
		}

		public String next() {
			int c = read();
			while (isSpaceChar(c))
				c = read();
			StringBuilder res = new StringBuilder();
			do {
				res.appendCodePoint(c);
				c = read();
			} while (!isSpaceChar(c));
			return res.toString();
		}

		public String nextLine() {
			int c = read();
			while (isEndline(c))
				c = read();
			StringBuilder res = new StringBuilder();
			do {
				res.appendCodePoint(c);
				c = read();
			} while (!isEndline(c));
			return res.toString();
		}
	}

}
/*
5 4
2 4 8 2 4
8
5
14
10
outputCopy
1
-1
3
2
*/