#include <bits/stdc++.h>
using namespace std;
const int maxn = 2e5 + 10;
const int MAX = 550;
const double dinf = 1235678;
const long long mod = 1e9 + 7;
int n, arr[MAX], used[MAX], q;
int first(int n) {
  int count = 0;
  while (n) {
    n >>= 1;
    count++;
  }
  return count - 1;
}
int main() {
  cin >> n >> q;
  for (int i = 0; i < n; i++) {
    int x;
    cin >> x;
    arr[first(x)]++;
  }
  while (q--) {
    int x, ans = 0;
    cin >> x;
    if (x & 1 and !arr[0]) {
      cout << "-1\n";
      continue;
    }
    int num = x;
    for (int j = 30; j >= 0 and num; --j) {
      int bit = (1 << j);
      if (!(num & (bit))) continue;
      for (int k = j; k >= 0 and bit; k--) {
        if (!arr[k]) continue;
        int req = bit / (1 << k);
        bit -= min(req, arr[k]) * (1 << k);
        ans += min(req, arr[k]);
        used[k] += min(req, arr[k]);
        arr[k] -= min(req, arr[k]);
      }
      if (bit > 0) {
        ans = -1;
        break;
      } else
        num -= (1 << j);
    }
    for (int i = 0; i < 31; i++) arr[i] += used[i], used[i] = 0;
    if (num > 0) ans = -1;
    cout << ans << '\n';
  }
  return 0;
}
