problem link:
https://www.codechef.com/problems/CKWLK
solution link:
https://www.codechef.com/viewsolution/27509071
Why I am getting runtime error (NZEC)?
Firstly, you have to print Yes and No instead of YES and NO and
for the input:
$ python prog.py
1
4
You are trying to touch parts of list a, that you are not supposed to
Traceback (most recent call last):
File "prog.py", line 20, in <module>
primefactors(n,a)
File "prog.py", line 6, in primefactors
a[2]+=1
IndexError: list index out of range
You might want to go through the editorial. It can be solved in a simpler way. 
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