public static String isBalanced(String s) {
        char[] arr = s.toCharArray();
        Stack<Character> stack = new Stack<>();
        for(char c : arr){
            if(c == '{' || c == '(' || c == '['){
                stack.push(c);
            }
            
            if(c == '}' || c == ')' || c == ']'){
                if(stack.isEmpty()) return "NO";
                char pop = stack.pop();
                if(c == '}' && pop != '{'){
                    return "NO";
                }
                if(c == ')' && pop != '('){
                    return "NO";
                }
                if(c == ']' && pop != '['){
                    return "NO";
                }
            }
        }
        
        if(stack.isEmpty()) return "YES";
        
        return "NO";
    }