题目描述
In every generation there is a Chosen One. She alone will stand against the vampires, the demons, and the forces of darkness. She is the Slayer. — Joss Whedon
Input
A string $s$ ($3 \le |s| \le 7$) consisting of lowercase English letters.
Output
A single string. If there is no answer, print "none" (without the quotes).
输入格式
见题面 Input 部分
输出格式
见题面 Output 部分
样例输入
tourist
样例输出
ooggqjx