Deleting digits

def deletedigit(n):
    steps = 0
    while n > 0:
        m = str(n)
        m = sorted(m, reverse=True)
        n -= int(m[0])
        steps += 1
    return steps

if __name__ == "__main__":
    n = int(input())
    print(deletedigit(n))

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