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.io.PrintWriter;
import java.util.Scanner;
import java.util.TreeSet;

public class Box {
    static Scanner sc = new Scanner(System.in);
    static PrintWriter pw = new PrintWriter(System.out);


    public static void main(String args[]) {
        int t = sc.nextInt();
        while (t-- > 0) {
            solve();
        }
        pw.flush();
        pw.close();
    }

    private static void solve() {
        int n = sc.nextInt();
        int a[] = new int[n];
        int ans[] = new int[n];
        for (int i = 0; i < n; i++) {
            a[i] = sc.nextInt();
        }

        TreeSet<Integer> tree = new TreeSet<>();
        for (int i = 1; i <= n; i++) {
            tree.add(i);
        }

        for (int i = 0; i < n; i++) {
            if (i == 0 || a[i] > a[i - 1]) {
                ans[i] = a[i];
                tree.remove(ans[i]);
            }
        }

        boolean valid = true;
        for (int i = 0; i < n; i++) {
            if (ans[i] == 0) {
                int x = tree.first();
                if (x <= a[i] && a[i] >= a[i - 1]) {
                    ans[i] = x;
                    tree.remove(x);
                } else {
                    valid = false;
                    break;
                }
            }
        }

        if (!valid) {
            pw.println("-1");
        } else {
            for (int x : ans) {
                pw.print(x + " ");
            }
            pw.println();
        }
    }
}