import java.util.* ;

import java.io.*; 

public class Solution {

    public static ArrayList<String> prettyJSON(String str) {

        // Write your code here.

        int bracketCount = 0;

        int arrayCount = 0;

        ArrayList<String> al = new ArrayList<>();

        StringBuilder spaces = new StringBuilder();

        // Stack<Character> st = new Stack<>();

        for(int i  = 0; i < str.length();i++)

        {

            char c = str.charAt(i);

            if(c == '{' || c == '['){

                StringBuilder files = new StringBuilder();

                files.append(spaces).append(c);

                al.add(files.toString());

                // System.out.println(spaces.toString() + c);

                spaces.append('\t');

            }

            else if(c == ']' || c=='}'){

                spaces.deleteCharAt(spaces.length() - 1);

                StringBuilder files = new StringBuilder();

                files.append(spaces).append(c);

                // System.out.println(spaces.toString() + "sddasd");

                if((i + 1) < str.length()){

                    if(str.charAt(i + 1) == ','){

                        files.append(",");

                        al.add(files.toString());

                        i++;

                        continue;

                    }

                }

                // System.out.println(spaces.toString() + c);

                al.add(spaces.toString() + c);

            }else{

                StringBuilder st = new StringBuilder();

                while( (c != '}' && c!= ']' && c !='{' && c!='[')){

                    st.append(c);

                    i++;

                    if(i<str.length()){

                        c = str.charAt(i);

                    }else{

                        break;

                    }

                }

                // System.out.println(st.toString());

                if(c ==  '}' || c == ']' || c  =='{' || c =='[')

                {

                    // System.out.println(st.toString());

                    i--;

                    // st.deleteCharAt(st.length() - 1);

                }

                // String sx="";

                // System.out.println(st.toString());

                String []arr =st.toString().split(",");

                if(arr.length == 1 && st.charAt(st.length() - 1) == ','){

                    String  sx= (spaces.toString() + arr[0] + ",");

                    al.add(sx);

                    continue;

                }

                // System.out.println(Arrays.toString(arr));

                for (int j = 0; j < arr.length; j++) {

                    if(j!=arr.length - 1){

                        String  sx= (spaces.toString() + arr[j] + ",");

                        al.add(sx);

                    }else{

                        String  sx= (spaces.toString() + arr[j]);

                        al.add(sx);

                    }

                }

            }

        }

        return al;

    }

}