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 java.io.*;
public class B_BOX {
	public static void main(String args[]) {
		Scanner in = new Scanner(System.in);
		int test_cases = in.nextInt();
		for(int i = 0; i < test_cases; i++) {
			int len = in.nextInt();
			int[] arr = new int[len];
			for(int j = 0; j < len; j++) {
				arr[j] = in.nextInt();
			}
			print_arr(arr, len);
			System.out.println();
		}
	}
	
	private static void print_arr(int[] arr, int len) {
		HashSet<Integer> set = new HashSet<>();
		int[] str = new int[len];
		int max = 0;
		int digit = 1;
		for (int i = 0; i < arr.length; i++) {
			if(arr[i] >len) {
				System.out.print(-1);
				return;
			}
			if(arr[i] < max) {
				System.out.print(-1);
				return;
			}
			else if(arr[i] == max) {
				if(max <= i) {
					System.out.print(-1);
					return;
				}
				else {
					str[i] = digit;
					digit++;
				}
			}
			else {
				str[i] = arr[i];
				max = arr[i];
				set.add(arr[i]);
			}
			set.add(arr[i]);
			while(set.contains(digit))digit++ ;
		}
		for(int i = 0; i < str.length; i++) 
			System.out.print(str[i]+" ");
	}
}