Sum of two arrays

in this question
first input is 1 0 2 9
second input is 3 4 5 6 7
output is 3, 5, 5, 9, 6
can u explain this output, how is it adding

@sktg99
Consider each array as one number.
1 0 2 9
_ + 3 4 5 6 7_
---------------
3 5 5 9 6

Final Output : 3, 5, 5, 9, 6