def stack(s):
brackets = SList()
while s :
p = s.pop(0)
if brackets.is_empty():
if p == "}" or p == ")":
print("Wrong brackets.")
return
elif p == "{" or p == "(":
brackets.push(p)
print(p)
else:
if p == '}':
pop = brackets.pop()
print(p)
if pop != '{':
print("Wrong brackets.")
return
elif p == ')':
pop = brackets.pop()
print(p)
if pop != '(':
print("Wrong brackets.")
return
elif p == "{" or p == "(":
brackets.push(p)
print(p)
if brackets.is_empty():
print("Good brackets.")
return
else:
print("Wrong brackets.")
return
