Help me in solving DIFFSUM problem

help
,
1

My issue

In the input format it says n1 and n2 will be readed two different lines.
But, sample example boyh are readed in single line
I tried both but it shows error for both the cases

My code

a = int(input())
b = int(input())
if a > b:
    print( a - b )
else:
    print( a + b )

Problem Link: DIFFSUM Problem - CodeChef