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;
int min_not_used(pair<vector<bool>, int>& v) {
  for (int i = (v.second + 1); i < (v.first.size()); ++i) {
    if (!v.first[i]) return i;
  }
  return -1;
}
signed main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  int t, n, a;
  vector<int> q, p;
  pair<vector<bool>, int> used;
  cin >> t;
  for (int o = 0; o < (t); ++o) {
    bool b = true;
    cin >> n;
    q.resize(n);
    p.resize(n);
    used.first.resize(n + 1, false);
    cin >> q[0];
    p[0] = q[0];
    used.first[p[0]] = true;
    used.second = (p[0] == 1 ? 2 : 1);
    for (int i = 0; i < (n - 1); ++i) {
      cin >> q[i + 1];
      p[i + 1] = (q[i + 1] == q[i] ? used.second : q[i + 1]);
      used.first[p[i + 1]] = true;
      if (p[i + 1] == used.second) used.second = min_not_used(used);
      if (p[i + 1] == -1) {
        cout << -1;
        b = false;
        break;
      }
    }
    a = 0;
    if (b) {
      for (int i = 0; i < (n); ++i) {
        a = max(a, p[i]);
        if (a != q[i]) {
          cout << -1;
          b = false;
          break;
        }
      }
      if (b) {
        for (int i = 0; i < (n); ++i) cout << p[i] << ' ';
      }
    }
    cout << '\n';
    used.first.clear();
  }
  return 0;
}