Problem c: make abba

Problem c: make abba

Time Limit: 1 Sec  Memory Limit: 128 MB
Submit: 26  Solved: 23
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Description

输入字符串a 和 字符串b
输入出 字符串 abba


Input

Hi
Bye

Output

HiByeByeHi

Sample Input Copy 

Yo
Alice

Sample Output Copy 

YoAliceAliceYo
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