Python program to find the difference between greatest and smallest digits presents in the number

Write a program in python to find the difference between greatest and smallest digits present in the number

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num=int(input("Enter any Number"))

min=9

max=0

while(num>0):

    digit=num%10;

    if(min>digit):

        min=digit;

    if(max<digit):

        max=digit;

    num=num//10;

diff=max-min

print("Greatest  Digit : ",max);

print("Smallest  Digit : ",min);

print("Difference  Between Greatest and Smallest  Digit : ",diff); 

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output :- 

Enter any Number8971521

Greatest  Digit :  9

Smallest  Digit :  1

Difference  Between Greatest and Smallest  Digit :  8