Hello, Im trying to figure out how to get this program to return the appended list of z (using Python), right now its not giving me any error messages but its not giving me any values either. Please help.

a=[1,2,4,6,8] b=[1,3,4,5,7,9]

def mystery(a,b): x1=len(a) x2=len(b) z=[] end=min(x1,x2)

for p in range(0,end): if a[p] != b[p]: z.append(p) return z print(str(z)) assert z==[1,3,4]