A string b is a subsequence of a string a if b can be obtained from a by deletion of several (possibly, zero or all) characters. For example, "xy" is a subsequence of "xzyw" and "xy", but not "yx".

You are given a string a. Your task is to reorder the characters of a so that "trygub" is not a subsequence of the resulting string.

In other words, you should find a string b which is a permutation of symbols of the string a and "trygub" is not a subsequence of b.

We have a truly marvelous proof that any string can be arranged not to contain "trygub" as a subsequence, but this problem statement is too short to contain it.

Input

The first line contains a single integer t (1≤ t≤ 100) — the number of test cases.

The first line of each test case contains a single integer n (1≤ n≤ 200) — the length of a.

The next line contains the string a of length n, consisting of lowercase English letters.

Output

For each test case, output a string b of length n which is a permutation of characters of the string a, and such that "trygub" is not a subsequence of it.

If there exist multiple possible strings b, you can print any.

Example

Input


3
11
antontrygub
15
bestcoordinator
19
trywatchinggurabruh


Output


bugyrtnotna
bestcoordinator
bruhtrywatchinggura

Note

In the first test case, "bugyrtnotna" does not contain "trygub" as a subsequence. It does contain the letters of "trygub", but not in the correct order, so it is not a subsequence.

In the second test case, we did not change the order of characters because it is not needed.

In the third test case, "bruhtrywatchinggura" does contain "trygu" as a subsequence, but not "trygub".
//package pack;

import java.util.*;

import java.io.*;

public class template
{

	public static void main(String[] args) throws Exception
	{
		BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
		PrintWriter writer = new PrintWriter(System.out);
		int t = Integer.parseInt(reader.readLine());
		while(t-- >0)
		{
			int n = Integer.parseInt(reader.readLine());
			String st = reader.readLine();
			String sub = "trygub";
			String res = "";
			String [] arr = new String[6];
			for(int i=0 ; i<6;i++)	arr[i]=""; 
			for(int i=0 ; i<n ; i++)
			{
				if(st.charAt(i) == 't')
				{
					arr[0]+= 't';
				}
				else if(st.charAt(i) == 'r')
				{
					arr[1]+= 'r';
				}
				else if(st.charAt(i) == 'y')
				{
					arr[2]+= 'y';
				}
				else if(st.charAt(i) == 'g')
				{
					arr[3]+= 'g';
				}
				else if(st.charAt(i) == 'u')
				{
					arr[4]+= 'u';
				}
				else if(st.charAt(i) == 'b')
				{
					arr[5]+= 'b';
				}
				else {
					res+= st.charAt(i);
				}
			}
			
			writer.println(res + arr[5]+ arr[4]+ arr[3]+ arr[2]+ arr[1]+ arr[0]);
			
			
			
			
			
		}
		
		
		writer.flush();
	}
	  
	

}
