private static boolean isMatch(String line) {
        if (line.length()%2 != 0) {
            return false;
        }
        
        Stack<Integer> intStack = new Stack<>();
        for (char c : line.toCharArray()) {
            switch (c) {
                case '[':
                    intStack.push(1);
                    break;
                case '{':
                    intStack.push(2);
                    break;
                case '(':
                    intStack.push(3);
                    break;
                case ')':
                    intStack.push(4);
                    break;
                case '}':
                    intStack.push(5);
                    break;
                case ']':
                    intStack.push(6);
                    break;
                default:
                    //
            }
        }
        
        Stack<Integer> leftoverStack = new Stack<>();
        
        while (intStack.size() > 0) {
            if (leftoverStack.isEmpty()) {
                leftoverStack.push(intStack.pop());
            } else {
                if (intStack.peek() + leftoverStack.peek() == 7 &&
                        intStack.peek() < leftoverStack.peek()) {
                    intStack.pop();
                    leftoverStack.pop();
                } else {
                    leftoverStack.push(intStack.pop());
                }
            }
        }
        
        return leftoverStack.isEmpty();
    }