Marina And Vasya

medium

Constructive algorithm

Question Solve Solutions

&lt;a href="https://codeforces.com/problemset/problem/584/C"&gt;https://codeforces.com/problemset/problem/584/C&lt;/a&gt;

Input Format

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Output Format

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Constraints

Notice

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Example

Input

3 2
abc
xyc

Output

ayd

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