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Sort a String
       

Given a string S consisting of lowercase latin letters, arrange all its letters in ascending order. 

Input:

The first line of the input contains T denoting number of testcases.Then follows description of each testcase.The first line of the testcase contains positive integer N denoting the length of string.The second line contains the string S.


Output:

For each testcase,output the sorted string.


Constraints:

1<=T<=100
1<=N<=100


Example:

Input:
1
5
edcab

Output:
abcde

**For More Examples Use Expected Output**


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Result:
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