import math
num = int(input("Enter a (int) number: "));
copyNum = num;
total = 0;
#Add Each digit from last digit.
while(copyNum != 0):
total += copyNum % 10
copyNum = math.floor(copyNum / 10)
print("The sum of digit %d: %d" % (num, total))
OUTPUT
Enter a (int) number: 12345
The sum of digit 12345: 15