import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {
    static class InputReader
    {
        private InputStream stream;
        private byte[] buf = new byte[1024];
        private int curChar;
        private int numChars;
        private SpaceCharFilter filter;

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

        public int read()
        {
            if (numChars==-1) 
                throw new InputMismatchException();

            if (curChar >= numChars)
            {
                curChar = 0;
                try 
                {
                    numChars = stream.read(buf);
                }
                catch (IOException e)
                {
                    throw new InputMismatchException();
                }

                if(numChars <= 0)				
                    return -1;
            }
            return buf[curChar++];
        }

        public String nextLine()
        {
            BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
            String str = "";
            try
            {
                str = br.readLine();
            }
            catch (IOException e)
            {
                e.printStackTrace();
            }
            return str;
        }
        public int nextInt()
        {
            int c = read();

            while(isSpaceChar(c)) 
                c = read();

            int sgn = 1;

            if (c == '-') 
            {
                sgn = -1;
                c = read();
            }

            int res = 0;
            do 
            {
                if(c<'0'||c>'9') 
                    throw new InputMismatchException();
                res *= 10;
                res += c - '0';
                c = read();
            }
            while (!isSpaceChar(c)); 

            return res * sgn;
        }

        public int nextsInt()
        {
            int c = read();

            while(isSpaceChar(c)) 
                c = read();
            c -='0';
            return c;
        }



        public long nextLong() 
        {
            int c = read();
            while (isSpaceChar(c))
                c = read();
            int sgn = 1;
            if (c == '-') 
            {
                sgn = -1;
                c = read();
            }
            long res = 0;

            do 
            {
                if (c < '0' || c > '9')
                    throw new InputMismatchException();
                res *= 10;
                res += c - '0';
                c = read();
            }
            while (!isSpaceChar(c));
                return res * sgn;
        }

        public double nextDouble() 
        {
            int c = read();
            while (isSpaceChar(c))
                c = read();
            int sgn = 1;
            if (c == '-') 
            {
                sgn = -1;
                c = read();
            }
            double res = 0;
            while (!isSpaceChar(c) && c != '.') 
            {
                if (c == 'e' || c == 'E')
                    return res * Math.pow(10, nextInt());
                if (c < '0' || c > '9')
                    throw new InputMismatchException();
                res *= 10;
                res += c - '0';
                c = read();
            }
            if (c == '.') 
            {
                c = read();
                double m = 1;
                while (!isSpaceChar(c)) 
                {
                    if (c == 'e' || c == 'E')
                        return res * Math.pow(10, nextInt());
                    if (c < '0' || c > '9')
                        throw new InputMismatchException();
                    m /= 10;
                    res += (c - '0') * m;
                    c = read();
                }
            }
            return res * sgn;
        }


        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 boolean isSpaceChar(int c) 
        {
            if (filter != null)
                return filter.isSpaceChar(c);
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }

        public String next() 
        {
            return readString();
        }

        public interface SpaceCharFilter 
        {
            public boolean isSpaceChar(int ch);
        }
    }

    public static void main(String[] args) 
    {
        InputReader s = new InputReader(System.in);		
		PrintWriter w = new PrintWriter(System.out);
        int n=s.nextInt();
        int q=s.nextInt();
        int f[]=new int[32];
        int pow[]=new int[32];
        pow[0]=1;
        for(int i=1;i<32;i++)
            pow[i]=2*pow[i-1];
        for(int i=0;i<n;i++)
        {
            int count=0;
            int a=s.nextInt();
            while(a>0)
            {
                a=a>>>1;
                count++;
            }
            count--;
            f[count]++;
        }
        for(int t=0;t<q;t++)
        {
            int b=s.nextInt();
            int count=0;
            int dup[]=new int[32];
            for(int i=31;i>=0 && b>0;i--)
            {
                int val=pow[i];
                dup[i]=f[i];
                if(b>=val && dup[i]>0)
                {
                    int req=b/val;
                    if(req<=dup[i])
                    {
                        dup[i]=dup[i]-req;
                        b=b%val;
                        count+=req;
                    }
                    else
                    {
                        count+=dup[i];
                        b=b-val*dup[i];
                        dup[i]=0;
                    }
                }
            }
            if(b>0)
                count=-1;
            w.println(count);
        }
        w.close();
    }
}