Python duplicate element finding function

def list_L(A,B):
    d=[]
    for i in range(A):
        C=B.count(A[i])
        d.append(C)
        k=d.count(0)
        return True
    else:
        return False



A=[int(x) for x in input("enter list1 elements:").split()]
B=[int(x) for x in input("enter list2 elements:").split()]

if True:
    print ("overlapping")
else:
    print ("non-overlapping")