#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...);
}
using ll = long long;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  ll n, q, temp;
  cin >> n >> q;
  vector<ll> v(32);
  for (int i = 0; i < n; i++) {
    cin >> temp;
    ll j = 0;
    while (temp) {
      if (temp % 2 != 0) v[j] += 1;
      temp /= 2;
      j++;
    }
  }
  while (q--) {
    cin >> temp;
    ll tot = 0;
    for (int i = 31; i >= 0; i--) {
      ll r = min((temp >> i), v[i]);
      tot += r;
      temp -= (1ll * pow(2, i) * r);
    }
    if (temp != 0)
      cout << "-1"
           << "\n";
    else
      cout << tot << "\n";
  }
  return 0;
}
