Correct answer but showing WA

#1

Your submission failed for the following input:

A : [ "ABCD" ]
Your function returned the following :
‘ABCD’
The expected returned value :
‘ABCD’

How to get ‘ABCD’ the right way?

#2

Add these two lines

if(size == 1)
return A[0];

I don’t know the reason why is this happening. I guess it is a bug on their side. If you get to know, please tell