def test_pop10():
assert st1.pop() == 'Overflow!!!'
def test_pop8():
assert st1.pop() == 2
def test_pop9():
assert st1.pop() == 1
def test_pop6():
assert st1.pop() == 4
def test_pop7():
assert st1.pop() == 3
def test_pop5():
assert st1.pop() == 5
def test_pop4():
assert st1.pop() == 6
def test_pop3():
assert st1.pop() == 7
def test_pop2():
assert st1.pop() == 8
def test_pop1():
assert st1.pop() == 9
