def test_16():
assert count8(9898) == 2
def test_14():
assert count8(188) == 3
def test_15():
assert count8(88888) == 9
def test_12():
assert count8(8818181) == 5
def test_13():
assert count8(1080) == 1
def test_3():
assert count8(8088) == 4
def test_11():
assert count8(1818188) == 5
def test_8():
assert count8(2348) == 1
def test_9():
assert count8(23884) == 3
def test_0():
assert count8(8) == 1
def test_7():
assert count8(8234) == 1
def test_6():
assert count8(88788) == 6
def test_5():
assert count8(81238) == 2
def test_4():
assert count8(123) == 0
def test_1():
assert count8(818) == 2
def test_10():
assert count8(0) == 0
def test_17():
assert count8(78) == 1
def test_2():
assert count8(8818) == 4