import java.util.Scanner;
import java.util.Stack;

public class Main {

    public static void main(String[] args) {
        Scanner reader = new Scanner(System.in);
        int n = Integer.parseInt(reader.nextLine());
        String[] input = new String[n+1];
        Stack<String> closers = new Stack<>();
        int spaceCounter =0;
        String stop = "#0";
        input[input.length-1] = stop;

        for (int i = 0; i <n ; i++) {
            input[i] = reader.nextLine();
        }

        int[] myIntArr = new int[n+1];
        myIntArr[myIntArr.length-1] = Integer.MIN_VALUE;

        for (int i = 0; i <n ; i++) {
            myIntArr[i] = Integer.parseInt(input[i].substring(1));
        }

        Stack<Integer> closerNumbers = new Stack<>();

        for (int i = 0; i <n ; i++) {
            addSpace(spaceCounter);
            System.out.printf("<%s>\n",input[i]);
            closers.push(String.format("</%s>\n",input[i]));
            closerNumbers.push(myIntArr[i]);
            if(myIntArr[i] < myIntArr[i+1]){
                spaceCounter++;
                continue;
            } else {
                addSpace(spaceCounter);
                System.out.print(closers.pop());
                closerNumbers.pop();
                int len = closers.size();
                for (int j = 0; j <len ; j++) {
                    if(closerNumbers.peek() >= myIntArr[i+1]){
                        spaceCounter--;
                        addSpace(spaceCounter);
                        System.out.print(closers.pop());
                        closerNumbers.pop();

                    } else {
                        break;
                    }
                }
            }
        }
    }

    private static void addSpace(int spaceCounter){
        if(spaceCounter >0){
            for (int i = 0; i <spaceCounter ; i++) {
                System.out.print(" ");
            }
        }
    }
}