DCA September 2021: Check number is "UNO" or "NOT UNO"

Following code is to check if a given positive integer input by user is UNO number or NOT UNO

For e.g. if user input is 1234 then here the sum of digits if the given number is 1+2+3+4 = 10 and then again if we sum the digits of resulting number i.e. 10 is 1+0 = 1 hence if this kind of sum of digits of a number is 1 then the number is said UNO else NOT UNO

NOT UNO e.g. 234 here sum of digits is 2+3+4 = 9, this is not equal to 1 hence it is said NOT UNO

Python Program: 

num = int(input()) #takes user input

def check_uno(num):
    sum_d = 0
    k = 0
    while num > 0:
        k = num % 10
        sum_d = sum_d + k
        num = num // 10
    if sum_d == 1 or sum_d == 10:
        print("UNO")
    elif (sum_d > 1 and sum_d < 10):
        print("NOT UNO")
    elif sum_d > 11:
        b = check_uno(sum_d)

check_uno(num)

#Output:

Input = 1234
Output = UNO

Input = 12345
Output = NOT UNO
Input = 345345
Output = NOT UNO