Help me to solve issue in my code

Question

There is error written as a comment. I do not understand what is wrong there. Please help.
https://code.sololearn.com/c6V5a3Oq2Sy2/?ref=app

Answer 1

The scope of variable a is only within the inner for loop. So it isn't valid to be used in the outer for loop.
You had better initialize a outside the loops.

Answer 2

a is not accessible outside the for loop.So if you wanna use it outside the loop, you will have to initialize it outside the loop

Answer 3

Thanks!