(i)nsert#, (p)op, (q)uit: 1  
(i)nsert#, (p)op, (q)uit: 2  1  
(i)nsert#, (p)op, (q)uit: 3  2  1  
(i)nsert#, (p)op, (q)uit: 4  3  2  1  
(i)nsert#, (p)op, (q)uit: 3  2  1  
(i)nsert#, (p)op, (q)uit: 2  1  
(i)nsert#, (p)op, (q)uit: 1  
(i)nsert#, (p)op, (q)uit: Empty stack.
(i)nsert#, (p)op, (q)uit: pop from empty stack failed.
(i)nsert#, (p)op, (q)uit: pop from empty stack failed.
(i)nsert#, (p)op, (q)uit: pop from empty stack failed.
(i)nsert#, (p)op, (q)uit: 4  
(i)nsert#, (p)op, (q)uit: 5  4  
(i)nsert#, (p)op, (q)uit: 6  5  4  
(i)nsert#, (p)op, (q)uit: 7  6  5  4  
(i)nsert#, (p)op, (q)uit: 6  5  4  
(i)nsert#, (p)op, (q)uit: 5  4  
(i)nsert#, (p)op, (q)uit: 4  
(i)nsert#, (p)op, (q)uit: Empty stack.
(i)nsert#, (p)op, (q)uit: