def test_0():
assert count11("11abc11") == 2
def test_1():
assert count11("abc11x11x11") == 3
def test_9():
assert count11("1Hello1") == 0
def test_10():
assert count11("Hello") == 0
def test_7():
assert count11("11x111x1111") == 4
def test_8():
assert count11("1x111") == 1
def test_6():
assert count11("hi") == 0
def test_5():
assert count11("") == 0
def test_4():
assert count11("1") == 0
def test_3():
assert count11("1111") == 2
def test_2():
assert count11("111") == 1