Here is the solution to List Overlap using functions in Python which is given below:
def listOverlap(num1, num2):
final_list = [ ]
for num in num1:
if num in num2:
final_list.append(num)
return final_list
a = [ ]
b = [ ]
n = int(input("Enter number of elements : "))
for i in range(0, n):
ele = int(input())
a.append(ele)
n1 = int(input("Enter number of elements : "))
for j in range(0, n1):
ele1 = int(input())
b.append(ele1)
print("The common elements in the two lists are: ")
print(listOverlap(a, b))