Find The Extra Letter :
Difficulty Level : Easy
Submissions : 237
Asked In :
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Given two strings $$$A$$$ and $$$B$$$. Removing a character from string $$$B$$$ makes it a permutation of $$$A$$$. Find that character
Input
The first line contains the number of test cases $$$1\le t\le 10^4$$$
Each test contains 3 lines.
The first line of test cases contains no of characters in string $$$A$$$, $$$1\le n\le 1000$$$
The second line contains string $$$A$$$
Third line contains string $$$B$$$ (size of $$$B$$$ is $$$n+1$$$)
The Sum of all n is less than $$$10^6$$$
Output
For each test case, output the character that needs to be removed.
Example
Input
13abcabcd
Output
d
