Answer:
def sumD4th(dword):
select = dword[3::4]
print(sum(select))
mylist = [1,2,3,4,5,6,7,8,9,10,11,12,13,14]
sumD4th(mylist)
Explanation:
The python program above defines a function called "sumD4th" that accepts a list as its argument. The variable "select" is created which is the subset of the list argument "mylist" containing the index items that is a sum of four. The output of the function is the sum of the items in the "select" list.