Given two strings in lowercase, your task is to find minimum number of manipulations required to make two strings anagram without deleting any character. If two strings contains same data set in any order then strings are called Anagrams.

Input : 
       s1 = "aba"
       s2 = "baa"
Output : 0
Explanation: Both String contains identical characters

Input :
       s1 = "ddcf"
       s2 = "cedk"
Output : 2
Explanation : Here, we need to change two characters
in either of the strings to make them identical. We 
can change 'd' and 'f' in s1 or 'e' and 'k' in s2.

Input:
The first line of input contains an integer T denoting the number of test cases. Then T test cases follow. First line of each test case contains an integer N, denoting the size of the string, next line contains two strings to make them anagrams.

Output:
Output the minimum number of manipulations required to make two strings anagram. If two strings are Anagram return 0.

Constraints:
1<=T<=100
1<=length of string<=10³

Example:
Input:
2
3
gfg fgg
5
abcde abcce

Output:
0
1

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