import stack

def check(string):
    '''Returns True if the parentheses in a term are balances; 
False otherwise'''  

    s = stack.Stack()

    for symbol in string:
        if symbol == '(':
            s.push(symbol)
        elif symbol == ')':
            if s.isEmpty():
                return False
            else:
                s.pop()
        else: # andere Symbole ignorieren 
            pass

    return s.size() == 0


term = input('Klammerterm mit "(" und ")": ')
print(check(term))