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 JAVA):

Solution:
import java.util.*;

import static java.lang.System.*;

public class Main
{
    public static void main(String[] args) {
        Scanner s = new Scanner(in);
        long t = s.nextInt();
        s.nextLine();

        outer: while (t-- > 0) {
            int n = s.nextInt();
            int[] arr = new int[n];
            Set<Integer> nums = new HashSet<>();

            for (int i = 0; i < n; i++) {
                arr[i] = s.nextInt();
                if (i > 0 && (arr[i] == 1 || arr[i] < arr[i - 1])) {
                    out.println(-1);
                    s.nextLine();
                    continue outer;
                }
                nums.add(arr[i]);
            }

            int min = 1;
            StringBuilder res = new StringBuilder();
            for (int i = 0; i < n; i++) {
                if (i == 0 || arr[i] > arr[i-1]) {
                    res.append(arr[i] + " ");
                    continue;
                }
                if (min == arr[i]) {
                    out.println(-1);
                    continue outer;
                }
                while (min < arr[i]) {
                    if (!nums.contains(min)) {
                        res.append(min + " ");
                        nums.add(min);
                        min++;
                        break;
                    }
                    min++;
                    if (min == arr[i]) {
                        out.println(-1);
                        continue outer;
                    }
                }
            }
            out.println(res);
        }
    }
}