Problem1870--【CSP2021-S-T3】回文

1870: 【CSP2021-S-T3】回文

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Time Limit : 1.000 sec  Memory Limit : 512 MB

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Solved: 1Submit Num: 1Statistics

Description

Input

Output

Sample Input Copy 

2
5
4 1 2 4 5 3 1 2 3 5
3
3 2 1 2 1 3

Sample Output Copy 

LRRLLRRRRL
-1

HINT



Source/Category

NOIP 
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