What is the output and why?

Question

What is the output?
What type of indexing is this?

a = [5,4,3,2,1,0]
print(a[a[a[2]+1]])

Answer 1

evaluation of order:

a[ a[ a[2]+1 ] =>

a[2] => 3
a[2]+1 = 3+1 => 4
a[ a[2]+1 ] = a[ 4 ] => 1
a[ a[ a[2]+1 ] = a[ 1 ] => 4

Outouts : 4
Hope it helps..

Answer 2

Manav Roy still not a proper explaination.