Doubt in one codeforce question

#1

Hii everyone…
I am trying to solve this question…

https://codeforces.com/contest/1379/problem/A

This is my solution–

I am not able to find the error… means don’t know where the test case is failing… If anyone could help…

#2

Hey @ashishnnnnn
One test case where your logic will fail:
1
15
abaca?acaba?aba
Here answer should be
YES
abacaxacabacaba

Follow the tutorial for correct implementation :https://codeforces.com/blog/entry/80216

#3

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