A11288 | Entertainment in MAC

Congratulations, you have been accepted to the Master's Assistance Center! However, you were extremely bored in class and got tired of doing nothing, so you came up with a game for yourself.

You are given a string $s$ and an even integer $n$ . There are two types of operations that you can apply to it:

1. Add the reversed string $s$ to the end of the string $s$ (for example, if $s = $ cpm, then after applying the operation $s = $ cpmmpc).
2. Reverse the current string $s$ (for example, if $s = $ cpm, then after applying the operation $s = $ mpc).

It is required to determine the lexicographically smallest $^{\dagger}$ string that can be obtained after applying exactly $n$ operations. Note that you can apply operations of different types in any order, but you must apply exactly $n$ operations in total.

$^{\dagger}$ A string $a$ is lexicographically smaller than a string $b$ if and only if one of the following holds:

- $a$ is a prefix of $b$ , but $a \ne b$ ;
- in the first position where $a$ and $b$ differ, the string $a$ has a letter that appears earlier in the alphabet than the corresponding letter in $b$ .

Each test consists of multiple test cases. The first line contains a single integer $t$ ( $1 \leq t \leq 500$ ) — the number of test cases. The description of the test cases follows.

The first line of each test case contains a single even integer $n$ ( $2 \leq n \leq 10^9$ ) — the number of operations applied to the string $s$ .

The second line of each test case contains a single string $s$ ( $1 \leq |s| \leq 100$ ), consisting of lowercase English letters, — the string to which the operations are applied.

For each test case, output a single line — the lexicographically smallest string that can be obtained after applying exactly $n$ operations.