import java.io.*;
import java.math.*;
import java.text.*;
import java.util.*;
import java.util.regex.*;
 
public class Solution 
{
    static class InputReader
	{
	    private final InputStream stream;
	    private final byte[] buf = new byte[8192];
	    private int curChar, snumChars;
 
	    public InputReader(InputStream st) {
	      this.stream = st;
	    }
 
	    public int read() {
	      if (snumChars == -1)
	        throw new InputMismatchException();
	      if (curChar >= snumChars) {
	        curChar = 0;
	        try {
	          snumChars = stream.read(buf);
	        } catch (IOException e) {
	          throw new InputMismatchException();
	        }
	        if (snumChars <= 0)
	          return -1;
	      }
	      return buf[curChar++];
	    }
 
	    public int nextInt() {
	      int c = read();
	      while (isSpaceChar(c)) {
	        c = read();
	      }
	      int sgn = 1;
	      if (c == '-') {
	        sgn = -1;
	        c = read();
	      }
	      int res = 0;
	      do {
	        res *= 10;
	        res += c - '0';
	        c = read();
	      } while (!isSpaceChar(c));
	      return res * sgn;
	    }
 
	    public long nextLong() {
	      int c = read();
	      while (isSpaceChar(c)) {
	        c = read();
	      }
	      int sgn = 1;
	      if (c == '-') {
	        sgn = -1;
	        c = read();
	      }
	      long res = 0;
	      do {
	        res *= 10;
	        res += c - '0';
	        c = read();
	      } while (!isSpaceChar(c));
	      return res * sgn;
	    }
 
	    public int[] nextIntArray(int n) {
	      int a[] = new int[n];
	      for (int i = 0; i < n; i++) {
	        a[i] = nextInt();
	      }
	      return a;
	    }
 
	    public String readString() {
	      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 (isSpaceChar(c))
	        c = read();
	      StringBuilder res = new StringBuilder();
	      do {
	        res.appendCodePoint(c);
	        c = read();
	      } while (!isEndOfLine(c));
	      return res.toString();
	    }
 
	    public boolean isSpaceChar(int c) {
	      return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
	    }
 
	    private boolean isEndOfLine(int c) {
	      return c == '\n' || c == '\r' || c == -1;
	    }
	}
    public static void main(String[] args) throws IOException 
    {
        InputReader in=new InputReader(System.in);
        int n=in.nextInt();
        int q=in.nextInt();
        long[] ar=new long[n];
        String[] rd=in.nextLine().trim().split("\\s+");
        HashMap<Long,Boolean> map=new HashMap<Long,Boolean>();
        for(int i=0;i<n;i++)
        {
            ar[i]=Long.parseLong(rd[i]);
            if(map.get(ar[i])==null)
            {
                map.put(ar[i],true);
            }
        }
        for(int i=0;i<q;i++)
        {
            long b=in.nextLong();
            long num=b;
            long count=0;
            long pw=1;
            long coins=0;
            
                boolean np=false;
                while(num>0)
                {
                    if(num%2==0)
                    {
                        num=num/2L;
                        count++;
                        pw*=2L;
                    }
                    else
                    {
                        coins++;
                        if(map.get(pw)==null)
                        {
                            np=true;
                            break;
                        }
                        num--;
                    }
                }
                if(np)
                {
                    System.out.println("-1");
                }
                else
                {
                    System.out.println(coins);
                }
        }
    }
}