Red OR Green
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Akash loves writing with red or green pen and to impress him his friend Kiran buys him N pens of 'red' or 'green' colors but Akash isn't happy
to see two coloured pens ,he wants all N pen of same color either 'red' or 'green'.He requested Kiran for the exchange of M pens(from the shop) 
so that he can have all N pens of same color i.e. either 'Red' or'Green.
Help kiran to find the minimum number of pens(M) she should ask for the exchange from the shopkeeper.


Input:
The first line of input contains an integer T denoting the number of test cases . Next line of input contains a positive  number N 
denoting the number of pens Kiran buys for Akash and the next line of input contains the string sequence of N pen colours-R for 'Red' and 'G' for 'green'.


Output:
For each test case , the output is in a new line containg an integer M which is the minimum number of pens Kiran has to exchange.


Constraints:
1<=T<=100

1<=N<=1000

Example:
Input :
1
5
RGRGR
Output:
2
Kiran can ask for the exchange of two green pens with red pens,thereby,making all 5 pens of red colour.

** For More Input/Output Examples Use 'Expected Output' option **

Contributor: RIYA BHARDWAJ
Author: Riya Bhardwaj


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