Basic23.py

# Write a Python program that accepts a positive number and subtracts from it the sum of its digits, and so on. Continue this operation until the number is positive.
def repeat_times(n):
    n_str = str(n)
    while(n>0):
        n -= sum([int(i) for i in list(n_str)])
        n_str = list(str(n))
    return n
print(repeat_times(9))
print(repeat_times(20))
print(repeat_times(110))
print(repeat_times(5674))