Runtime Error in "Matched Brackets" (ZCO12001)

help
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1

why is this showing runtime error??Plz help.!
https://www.codechef.com/viewsolution/36125898
Problem code: ZCO12001

2

Change the array input to-
[int(x) for x in input().split()]
Now it shows WA instead of RE

3

The solution was not showing a RE. Changing array input don’t differ.