Codeforces Round 836 (Div. 2) |
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Finished |
A palindrome is a string that reads the same backward as forward. For example, the strings $$$\texttt{z}$$$, $$$\texttt{aaa}$$$, $$$\texttt{aba}$$$, and $$$\texttt{abccba}$$$ are palindromes, but $$$\texttt{codeforces}$$$ and $$$\texttt{ab}$$$ are not.
The double of a string $$$s$$$ is obtained by writing each character twice. For example, the double of $$$\texttt{seeing}$$$ is $$$\texttt{sseeeeiinngg}$$$.
Given a string $$$s$$$, rearrange its double to form a palindrome. Output the rearranged string. It can be proven that such a rearrangement always exists.
The first line of input contains $$$t$$$ ($$$1 \leq t \leq 1000$$$) — the number of test cases.
The only line of each test case contains a single string $$$s$$$ ($$$1 \leq |s| \leq 100$$$) consisting only of lowercase English letters.
Note that the sum of $$$|s|$$$ over all test cases is not bounded.
For each test case, output a palindromic string of length $$$2 \cdot |s|$$$ that is a rearrangement of the double of $$$s$$$.
4asururuerrorgornanutforajaroftuna
aa suurruurruus rgnororerrerorongr aannuuttffoorraajjaarrooffttuunnaa
In the first test case, the double of $$$\texttt{a}$$$ is $$$\texttt{aa}$$$, which is already a palindrome.
In the second test case, the double of $$$\texttt{sururu}$$$ is $$$\texttt{ssuurruurruu}$$$. If we move the first $$$\texttt{s}$$$ to the end, we get $$$\texttt{suurruurruus}$$$, which is a palindrome.
In the third test case, the double of $$$\texttt{errorgorn}$$$ is $$$\texttt{eerrrroorrggoorrnn}$$$. We can rearrange the characters to form $$$\texttt{rgnororerrerorongr}$$$, which is a palindrome.
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