Python - Súper Slice

def superLice(num1, num2):

    num1=str(num1)

    num2=str(num2)

    last=""

    start=0

    for i in range(len(num1)):

        try:

            num2.index(num1[start:i+1])

            if len(num1[start:i+1])>len(last):

                last=num1[start:i+1]

        except:

            start=i

    return last

print(superLice(1234560, 230456)) # 456

print(superLice(8935678, 2356745)) # 3567

print(superLice(890, 89076)) # 890

print(superLice(45111, 71121)) # 11

print(superLice(213590554, 542135904)) # 213590