class Stack:

    def __init__(self):
        self.v = list()

    def Push(self, val):
        self.v.append(val)

    def Pop(self):
        if not self.IsEmpty():
            return self.v.pop()
        else:
            print('Empty Queue')

    def IsEmpty(self):
        return len(self.v) == 0


openings = set(['[', '(', '{'])
closings = {'(': ')', '[': ']', '{': '}'}


def is_balanced(arr: list) ->bool:

    def apply_logic(s: Stack, n: str) ->Stack:
        last = s.Pop()
        if last in openings:
            if closings[last] == n:
                return s
        else:
            s.Push(last)
            s.Push(n)
            return s
    s = Stack()
    for n in arr:
        if n in openings:
            s.Push(n)
        else:
            s = apply_logic(s, n)
    return s.IsEmpty()


arr = '{[()]}()'
is_balanced(arr)

e21441a9258b78c19b277b368e43831539f8c1a2
class Stack:

    def __init__(self):
        self.v = list()
    <mask token>

    def Pop(self):
        if not self.IsEmpty():
            return self.v.pop()
        else:
            print('Empty Queue')

    def IsEmpty(self):
        return len(self.v) == 0


<mask token>

class Stack:

    def __init__(self):
        self.v = list()

    def Push(self, val):
        self.v.append(val)

    def Pop(self):
        if not self.IsEmpty():
            return self.v.pop()
        else:
            print('Empty Queue')

    def IsEmpty(self):
        return len(self.v) == 0


<mask token>


def is_balanced(arr: list) ->bool:

    def apply_logic(s: Stack, n: str) ->Stack:
        last = s.Pop()
        if last in openings:
            if closings[last] == n:
                return s
        else:
            s.Push(last)
            s.Push(n)
            return s
    s = Stack()
    for n in arr:
        if n in openings:
            s.Push(n)
        else:
            s = apply_logic(s, n)
    return s.IsEmpty()


<mask token>

class Stack:

    def __init__(self):
        self.v = list()

    def Push(self, val):
        self.v.append(val)

    def Pop(self):
        if not self.IsEmpty():
            return self.v.pop()
        else:
            print('Empty Queue')

    def IsEmpty(self):
        return len(self.v) == 0


<mask token>


def is_balanced(arr: list) ->bool:

    def apply_logic(s: Stack, n: str) ->Stack:
        last = s.Pop()
        if last in openings:
            if closings[last] == n:
                return s
        else:
            s.Push(last)
            s.Push(n)
            return s
    s = Stack()
    for n in arr:
        if n in openings:
            s.Push(n)
        else:
            s = apply_logic(s, n)
    return s.IsEmpty()


<mask token>
is_balanced(arr)

class Stack:

    def __init__(self):
        self.v = list()

    def Push(self, val):
        self.v.append(val)

    def Pop(self):
        if not self.IsEmpty():
            return self.v.pop()
        else:
            print('Empty Queue')

    def IsEmpty(self):
        return len(self.v) == 0


openings = set(['[', '(', '{'])
closings = {'(': ')', '[': ']', '{': '}'}


def is_balanced(arr: list) ->bool:

    def apply_logic(s: Stack, n: str) ->Stack:
        last = s.Pop()
        if last in openings:
            if closings[last] == n:
                return s
        else:
            s.Push(last)
            s.Push(n)
            return s
    s = Stack()
    for n in arr:
        if n in openings:
            s.Push(n)
        else:
            s = apply_logic(s, n)
    return s.IsEmpty()


arr = '{[()]}()'
is_balanced(arr)
