Given a string 'str' of size ‘n’. The task is to remove or delete minimum number of characters from the string so that the resultant string is palindrome.

Note: The order of characters should be maintained.

Input:

The first line of input contains an integer T denoting the number of test cases. Then T test cases follow. The first line of each test case contains an integer N denoting the length of string str.

The second line of each test case contains the string str.

Output:

Print the minimum number of characters to be deleted to make the string a palindrome for each testcase in a new line.

Constraints:

1<= T <=100

1<= N <= 1000

Example:

Input:

1

7

aebcbda

Output:

2