What should be the output of A…B…B…A ?

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This is NOT allowed. This clarification should had been asked at the comments section- and in case they didnt reply it meant that either its given in statement or is a hint.

I am currently deleting answers for now, but please remember that this will lead to SUSPENSION of your account, (even blocking of your account from codechef itself- this is something we are really strict about).

Please refrain from discussing questions of a live contest.