Problem: A rare article in the Internet is posted without a possibility to comment it. On a Polycarp's website each article has comments feed.

Each comment on Polycarp's website is a non-empty string consisting of uppercase and lowercase letters of English alphabet. Comments have tree-like structure, that means each comment except root comments (comments of the highest level) has exactly one parent comment.

When Polycarp wants to save comments to his hard drive he uses the following format. Each comment he writes in the following format: 

  * at first, the text of the comment is written; 
  * after that the number of comments is written, for which this comment is a parent comment (i. e. the number of the replies to this comments); 
  * after that the comments for which this comment is a parent comment are written (the writing of these comments uses the same algorithm). 

All elements in this format are separated by single comma. Similarly, the comments of the first level are separated by comma.

For example, if the comments look like:

<image>

then the first comment is written as "hello,2,ok,0,bye,0", the second is written as "test,0", the third comment is written as "one,1,two,2,a,0,b,0". The whole comments feed is written as: "hello,2,ok,0,bye,0,test,0,one,1,two,2,a,0,b,0". For a given comments feed in the format specified above print the comments in a different format: 

  * at first, print a integer d — the maximum depth of nesting comments; 
  * after that print d lines, the i-th of them corresponds to nesting level i; 
  * for the i-th row print comments of nesting level i in the order of their appearance in the Policarp's comments feed, separated by space. 

Input

The first line contains non-empty comments feed in the described format. It consists of uppercase and lowercase letters of English alphabet, digits and commas. 

It is guaranteed that each comment is a non-empty string consisting of uppercase and lowercase English characters. Each of the number of comments is integer (consisting of at least one digit), and either equals 0 or does not contain leading zeros.

The length of the whole string does not exceed 106. It is guaranteed that given structure of comments is valid. 

Output

Print comments in a format that is given in the statement. For each level of nesting, comments should be printed in the order they are given in the input.

Examples

Input

hello,2,ok,0,bye,0,test,0,one,1,two,2,a,0,b,0


Output

3
hello test one 
ok bye two 
a b 


Input

a,5,A,0,a,0,A,0,a,0,A,0


Output

2
a 
A a A a A 


Input

A,3,B,2,C,0,D,1,E,0,F,1,G,0,H,1,I,1,J,0,K,1,L,0,M,2,N,0,O,1,P,0


Output

4
A K M 
B F H L N O 
C D G I P 
E J 

Note

The first example is explained in the statements. 

Solution (in JAVA):

Solution:
import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.io.BufferedWriter;
import java.util.Collection;
import java.util.HashMap;
import java.util.InputMismatchException;
import java.io.IOException;
import java.io.FileInputStream;
import java.util.Stack;
import java.util.ArrayList;
import java.util.Objects;
import java.util.StringTokenizer;
import java.io.Writer;
import java.io.OutputStreamWriter;
import java.util.Queue;
import java.util.LinkedList;
import java.io.InputStream;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        OutputWriter out = new OutputWriter(outputStream);
        EComments solver = new EComments();
        solver.solve(1, in, out);
        out.close();
    }

    static class EComments {
        private ArrayList<Integer>[] graph = new ArrayList[1_000_001];
        private int[] dis;
        private int max_dis = 0;
        private ArrayList<Integer> al = new ArrayList<>();

        private void addEdge(int ver, int parent) {
            graph[parent].add(ver);
        }

        private void bfs(int start, int tokens) {
            dis = new int[tokens];
            Arrays.fill(dis, -1);
            dis[start] = 0;
            al.add(0);
            Queue<Integer> queue = new LinkedList<>();
            queue.offer(start);
            while (!queue.isEmpty()) {
                int v = queue.poll();
                for (int X : graph[v]) {
                    queue.offer(X);
                    dis[X] = dis[v] + 1;
                    max_dis = Math.max(max_dis, dis[X]);
                    al.add(X);
                }
            }
        }

        public void solve(int testNumber, InputReader in, OutputWriter out) {
            String str = in.nextLine();
            for (int i = 0; i < 1000001; i++) graph[i] = new ArrayList<>();
            StringTokenizer tokenizer = new StringTokenizer(str, ",");
            int tokenNumber = 1;
            Stack<Util.Pair<Integer>> stack = new Stack<>();
            stack.push(new Util.Pair<>(0, -1));
            HashMap<Integer, String> hm = new HashMap<>();
            while (tokenizer.hasMoreTokens()) {
                String token = tokenizer.nextToken();
                int numOfChildren = Integer.parseInt(tokenizer.nextToken());
                int numOfSiblings = stack.peek().y;
                int eliminated = 0;
                while (numOfSiblings == 0) {
                    stack.pop();
                    eliminated++;
                    numOfSiblings = stack.peek().y;
                    if (numOfSiblings != 0) {
                        stack.peek().y -= eliminated;
                        eliminated = 0;
                        numOfSiblings = stack.peek().y;
                    }
                }
                hm.put(tokenNumber, token);
                addEdge(tokenNumber, stack.peek().x);
                stack.push(new Util.Pair<>(tokenNumber, numOfChildren));

                tokenNumber++;
            }
            bfs(0, tokenNumber);
//        out.println(Arrays.toString(dis));
//        out.println(al.toString());
            out.print(max_dis);
            for (int i = 1; i < al.size(); i++) {
                String token = hm.get(al.get(i));
                if (dis[al.get(i)] > dis[al.get(i - 1)]) out.println();
                out.printsc(token);
            }
            out.println();
            out.flush();
        }

    }

    static class Util {
        public static class Pair<T> {
            public T x;
            public T y;

            public Pair(T x, T y) {
                this.x = x;
                this.y = y;
            }

            public boolean equals(Object obj) {
                if (obj == this) return true;
                if (!(obj instanceof Util.Pair)) return false;
                Util.Pair<T> pair = (Util.Pair<T>) obj;
                return this.x == pair.x && this.y == pair.y;
            }

            public String toString() {
                return ("(" + this.x + "," + this.y + ")");
            }

            public int hashCode() {
                return Objects.hash(x, y);
            }

        }

    }

    static class OutputWriter {
        private final PrintWriter writer;
        private ArrayList<String> res = new ArrayList<>();
        private StringBuilder sb = new StringBuilder("");

        public OutputWriter(OutputStream outputStream) {
            writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));
        }

        public OutputWriter(Writer writer) {
            this.writer = new PrintWriter(writer);
        }

        public void println(Object... objects) {
            for (int i = 0; i < objects.length; i++) {
                sb.append(objects[i]);
            }
            res.add(sb.toString());
            sb = new StringBuilder("");
        }

        public void print(Object... objects) {
            for (int i = 0; i < objects.length; i++) {
                sb.append(objects[i]);
            }
        }

        public void printsc(Object... objects) {
            for (int i = 0; i < objects.length; i++) {
                sb.append(objects[i]).append(' ');
            }
        }

        public void close() {
//        writer.flush();
            writer.close();
        }

        public void flush() {
            for (String str : res) writer.printf("%s\n", str);
            res.clear();
            sb = new StringBuilder("");
        }

    }

    static class InputReader {
        private InputStream stream;
        private byte[] buf = new byte[8192];
        private int curChar;
        private int numChars;

        public InputReader(InputStream stream) {
            this.stream = stream;
        }

        public InputReader(FileInputStream file) {
            this.stream = file;
        }

        public int read() {
            if (numChars == -1) {
                throw new InputMismatchException();
            }
            if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new InputMismatchException();
                }
                if (numChars <= 0) {
                    return -1;
                }
            }
            return buf[curChar++];
        }

        public String nextLine() {
            int c = read();
            while (isSpaceChar(c))
                c = read();
            StringBuilder res = new StringBuilder();
            do {
                res.appendCodePoint(c);
                c = read();
            } while (!isEndOfLine(c));
            return res.toString();
        }

        private boolean isSpaceChar(int c) {
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }

        private boolean isEndOfLine(int c) {
            return c == '\n' || c == '\r' || c == -1;
        }

    }
}