import java.io.*;
import java.util.*;

public final class ideone2 {
	public static void main(String []args) throws java.lang.Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

		String input1 [] = br.readLine().split(" ");

		int n = Integer.parseInt(input1[0]);
		int q = Integer.parseInt(input1[1]);

		int powers[] = new int[31];
		powers[0] = 1;

		for(int i = 1 ; i < 31 ; i = i + 1) {
			powers[i] = powers[i-1] * 2;
		}

		int coinsForPower[] = new int[n];

		String input2[] = br.readLine().split(" ");

		for(int i = 0; i < n ; i = i + 1) {
			coinsForPower[i] = Integer.parseInt(input2[i]); 
			// System.out.println("coin poewer " + coinsForPower[i]);
		}

		int powerIndicies[] = new int[32];

		Arrays.fill(powerIndicies, 0);

		for(int i = 0 ; i < n ; i = i + 1) {
			int theLog = getLog(coinsForPower[i],2);
			// System.out.println("the Log " + theLog + " coinsForPower " + coinsForPower[i]);
			powerIndicies[theLog]++;

		}

		for(int i = 0 ; i < q ; i = i + 1) {
			int query = Integer.parseInt(br.readLine());
			int ans = 0;
			int coins = 0;
			for(int j = 30 ; j >= 0 ; j = j - 1) {
				if(powerIndicies[j] >= 1) {
					// System.out.println(j + "  this is power");
					int numberOfCoinsPossible = query / powers[j];
					int numberOfCoinsPresent = powerIndicies[j];
					if(numberOfCoinsPresent <= numberOfCoinsPossible) {
						// System.out.println("numberOfCoinsPresent " + numberOfCoinsPresent +" powersi " + powers[j]);
						query = query - numberOfCoinsPresent * powers[j];
						coins = coins + numberOfCoinsPresent;
					}
					else {
						// System.out.println("numberOfCoinsPossible  " + numberOfCoinsPossible +" powersi " + powers[j]);

						query = query - numberOfCoinsPossible * powers[j];
						coins = coins + numberOfCoinsPossible;
					}
				}
			}

			if(query == 0) {
				// System.out.println("Final answer " + " sdfce");
				System.out.println(coins);
			}
			else {
				System.out.println(-1);
			}
		}
	}

	public static int getLog(int value, int base){
		int possibleValue = 1;
		int ans = 0;
		while(possibleValue != value) {
			possibleValue = possibleValue * base;
			ans = ans + 1;
		}

		return ans;
	}
}