Problem: Permutation p is a sequence of integers p=[p_1, p_2, ..., p_n], consisting of n distinct (unique) positive integers between 1 and n, inclusive. For example, the following sequences are permutations: [3, 4, 1, 2], [1], [1, 2]. The following sequences are not permutations: [0], [1, 2, 1], [2, 3], [0, 1, 2].

The important key is in the locked box that you need to open. To open the box you need to enter secret code. Secret code is a permutation p of length n. 

You don't know this permutation, you only know the array q of prefix maximums of this permutation. Formally:

  * q_1=p_1, 
  * q_2=max(p_1, p_2), 
  * q_3=max(p_1, p_2,p_3), 
  * ... 
  * q_n=max(p_1, p_2,...,p_n). 



You want to construct any possible suitable permutation (i.e. any such permutation, that calculated q for this permutation is equal to the given array).

Input

The first line contains integer number t (1 ≤ t ≤ 10^4) — the number of test cases in the input. Then t test cases follow.

The first line of a test case contains one integer n (1 ≤ n ≤ 10^{5}) — the number of elements in the secret code permutation p.

The second line of a test case contains n integers q_1, q_2, ..., q_n (1 ≤ q_i ≤ n) — elements of the array q for secret permutation. It is guaranteed that q_i ≤ q_{i+1} for all i (1 ≤ i < n).

The sum of all values n over all the test cases in the input doesn't exceed 10^5.

Output

For each test case, print:

  * If it's impossible to find such a permutation p, print "-1" (without quotes). 
  * Otherwise, print n distinct integers p_1, p_2, ..., p_n (1 ≤ p_i ≤ n). If there are multiple possible answers, you can print any of them. 

Example

Input


4
5
1 3 4 5 5
4
1 1 3 4
2
2 2
1
1


Output


1 3 4 5 2 
-1
2 1 
1 

Note

In the first test case of the example answer [1,3,4,5,2] is the only possible answer:

  * q_{1} = p_{1} = 1; 
  * q_{2} = max(p_{1}, p_{2}) = 3; 
  * q_{3} = max(p_{1}, p_{2}, p_{3}) = 4; 
  * q_{4} = max(p_{1}, p_{2}, p_{3}, p_{4}) = 5; 
  * q_{5} = max(p_{1}, p_{2}, p_{3}, p_{4}, p_{5}) = 5. 



It can be proved that there are no answers for the second test case of the example.

Solution (in CPP):

Solution:
#include <bits/stdc++.h>
using namespace std;
const long long INF = (long long)2e9;
const long long inf = (long long)2e18;
const long double eps = (long double)1e-6;
const long long mod = (long long)1e9 + 7;
const long long MAXN = (long long)5e5 + 1;
const long long MAXC = (long long)6e6;
const long long MAXLOG = 19;
const long long maxlen = (long long)1e5;
const long long asci = (long long)256;
const long long block = 707;
template <class T>
istream &operator>>(istream &in, vector<T> &arr) {
  for (T &cnt : arr) {
    in >> cnt;
  }
  return in;
};
void solve() {
  int n;
  cin >> n;
  vector<long long> q(n);
  cin >> q;
  vector<long long> used(n + 1);
  int it = 1;
  vector<long long> p(n, -1);
  p[0] = q[0];
  used[q[0]] = 1;
  for (int i = 1; i < n; ++i) {
    if (q[i] < q[i - 1]) {
      cout << "-1\n";
      return;
    }
    if (q[i] != q[i - 1]) {
      p[i] = q[i];
      used[p[i]] = 1;
    } else {
      while (it < q[i] && used[it]) it++;
      if (it == q[i]) {
        cout << "-1\n";
        return;
      }
      p[i] = it;
      used[p[i]] = 1;
    }
  }
  for (int i = 0; i < n; ++i) {
    cout << p[i] << " ";
  }
  cout << "\n";
}
int main() {
  srand(time(0));
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr);
  cout.tie(nullptr);
  cout.precision(30);
  int t;
  cin >> t;
  while (t--) solve();
  return 0;
}