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