CF120I.Luck is in Numbers
普及/提高-
通过率:0%
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题目描述
The first line contains the number of the ticket that consists of k characters ( k=2n,1<=n<=105 ).
输入格式
Print the number of the sought ticket or "-1" (without the quotes) if no such ticket exists.
输出格式
无
输入输出样例
输入#1
13
输出#1
20
输入#2
2345
输出#2
2348
输入#3
88
输出#3
-1