Deleting digits

def deletingDigits(n):
    count = 0
    arr = list(map(int, str(n)))
    max_digit = max(arr)
    remainder = n
    while remainder > 0:
        remainder -= max_digit
        arr = list(map(int, str(remainder)))
        max_digit = max(arr)
        count += 1



    return count

def main():
    n = int(input())
    print(deletingDigits(n))

if __name__ == "__main__":
    main()

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED