Medial number

Problem to find medial number from list.

Example-1:

Input    : l = [ 1, 2, 3, 4, 5]
Output   : 3

Example-2:

Input    : l = [ 1, 2, 3, 4]
Output   : Null

Solution

l = [ 1, 2, 3, 4, 5]

if(len(l) % 2 == 0):

    print("Null")

else:

    a = len(l)//2

    print(l[a])

Output