#include <bits/stdc++.h>
using namespace std;
void __print(int x) { cerr << x; }
void __print(long x) { cerr << x; }
void __print(long long x) { cerr << x; }
void __print(unsigned x) { cerr << x; }
void __print(unsigned long x) { cerr << x; }
void __print(unsigned long long x) { cerr << x; }
void __print(float x) { cerr << x; }
void __print(double x) { cerr << x; }
void __print(long double x) { cerr << x; }
void __print(char x) { cerr << '\'' << x << '\''; }
void __print(const char *x) { cerr << '\"' << x << '\"'; }
void __print(const string &x) { cerr << '\"' << x << '\"'; }
void __print(bool x) { cerr << (x ? "true" : "false"); }
template <typename T, typename V>
void __print(const pair<T, V> &x) {
  cerr << '{';
  __print(x.first);
  cerr << ',';
  __print(x.second);
  cerr << '}';
}
template <typename T>
void __print(const T &x) {
  int f = 0;
  cerr << '{';
  for (auto &i : x) cerr << (f++ ? "," : ""), __print(i);
  cerr << "}";
}
void _print() { cerr << "]\n"; }
template <typename T, typename... V>
void _print(T t, V... v) {
  __print(t);
  if (sizeof...(v)) cerr << ", ";
  _print(v...);
}
const long long MOD = 1e9 + 7;
long long size = 10000000;
long long p(long long n) {
  long long count = 0;
  while (n > 0) {
    n /= 2;
    count++;
  }
  return count - 1;
}
int32_t main() {
  ios::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  long long T = 1;
  while (T--) {
    long long n, q;
    cin >> n >> q;
    vector<long long> count(33, 0);
    vector<long long> a(n);
    for (long long i = 0; i < n; i++) cin >> a[i];
    for (long long i = 0; i < n; i++) {
      count[p(a[i])]++;
    }
    for (long long i = 0; i < q; i++) {
      long long num;
      cin >> num;
      long long loc = 0;
      long long ans = 0;
      for (long long j = 32; j >= 0; j--) {
        if (count[j]) {
          long long val = num / pow(2, j);
          long long mn = min(val, count[j]);
          num = num - mn * pow(2, j);
          ans += mn;
          if (num == 0) {
            loc = 1;
            break;
          } else if (num < 0) {
            loc = 0;
            break;
          }
        }
      }
      if (loc)
        cout << ans << '\n';
      else
        cout << -1 << '\n';
    }
  }
  return 0;
}
