重复回文 - 题目

#17870. 重复回文

统计

AI Translation — This statement was translated using AI and may contain inaccuracies. Please refer to the original statement if in doubt.

给你一个由小写字母组成的字符串 $s$ 和一个整数 $k$。

通过将 $k$ 个 $s$ 拼接在一起构造一个新字符串 $t$。判断 $t$ 是否为回文串（即正着读和反着读都一样）。

输入格式

第一行包含一个由小写字母组成的字符串 $s$。($1 \le |s| \le 250000$)

第二行包含一个整数 $k$。($1 \le k \le 10^{18}$)

输出格式

如果 $t$ 是回文串，输出 YES。否则，输出 NO。

样例

输入样例 1

abc
3

输出样例 1

NO

输入样例 2

abba
1

输出样例 2

YES

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