【字符串】回文串
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Description
回文串是从左到右或者从右到左读起来都一样的字符串，试编程判别一个字符串是否为回文串。
Input Format
输入一个字符串。串长度<255.
Output Format
判别输入的字符串是否为回文串，是输出"Y",否则输出"N"。
Sample
样例输入
abcba
样例输出
Y