Periodic Table

In this task, for input:
1
hes

what is correct answer: HeS or HEs ?
I think both, but ...
My result is HEs. Can someone look post (pascal)
http://www.z-trening.com/new/www/html/submit.php?subm_stat=1&submit=7100045550
and help me? Maybe, admin.

It was said that there aren't any such inputs in test cases.

That wasn't said in task, how do you know that? Let me know...

Author wrote that on the forums

Yes, exactly. But in general, if something isn't written, that means either solution should work (or there won't be such cases). Anything different, it would mean it's my fault.