Deleting digits

def delete(n:int):
    ops = 0
    while n > 0:
        n -= max(list(map(int, list(str(n)))))
        ops += 1
    return ops






if __name__ == "__main__":
    n = int(input())
    #n = list(map(int, list(str(input()))))
    res = delete(n)
    print(res)


"""
Input:
27

Output:
5

Explanation: An optimal solution is 27  20  18  10  9  0

"""

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