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.io.BufferedWriter;
import java.io.Writer;
import java.io.OutputStreamWriter;
import java.io.InputStream;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 *
 * @author Jialin Ouyang (Jialin.Ouyang@gmail.com)
 */
public class Main {
  public static void main(String[] args) {
    InputStream inputStream = System.in;
    OutputStream outputStream = System.out;
    QuickScanner in = new QuickScanner(inputStream);
    QuickWriter out = new QuickWriter(outputStream);
    TaskE solver = new TaskE();
    solver.solve(1, in, out);
    out.close();
  }

  static class TaskE {
    static int MAXN = 1000000;
    QuickScanner in;
    CharArrayList[] res = new CharArrayList[MAXN];
    boolean ended = false;

    public void solve(int testNumber, QuickScanner in, QuickWriter out) {
      this.in = in;
      for (int i = 0; i < MAXN; ++i) {
        res[i] = new CharArrayList();
      }
      while (!ended) {
        dfs(0);
      }
      int cnt;
      for (cnt = 0; !res[cnt].isEmpty(); ++cnt) {
      }
      out.println(cnt);
      for (int i = 0; i < cnt; ++i) {
        CharArrayList lst = res[i];
        for (int j = 0; j < lst.size; ++j) {
          out.print(lst.get(j));
        }
        out.println();
      }
    }

    void dfs(int depth) {
      CharArrayList lst = res[depth];
      if (!lst.isEmpty()) {
        lst.add(' ');
      }
      next(lst);
      for (int i = nextInt(); i > 0; --i) {
        dfs(depth + 1);
      }
    }

    void next(CharArrayList lst) {
      int c = in.nextChar();
      do {
        lst.add((char) c);
        c = in.nextChar();
      } while (('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z'));
    }

    int nextInt() {
      int res = 0;
      int c = in.nextChar();
      do {
        res = res * 10 + c - '0';
        c = in.nextChar();
      } while ('0' <= c && c <= '9');
      ended = c != ',';
      return res;
    }

  }

  static class QuickWriter {
    private final PrintWriter writer;

    public QuickWriter(OutputStream outputStream) {
      this.writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));
    }

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

    public void print(Object... objects) {
      for (int i = 0; i < objects.length; ++i) {
        if (i > 0) {
          writer.print(' ');
        }
        writer.print(objects[i]);
      }
    }

    public void println(Object... objects) {
      print(objects);
      writer.print('\n');
    }

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

  }

  static class QuickScanner {
    private static final int BUFFER_SIZE = 1024;
    private InputStream stream;
    private byte[] buffer;
    private int currentPosition;
    private int numberOfChars;

    public QuickScanner(InputStream stream) {
      this.stream = stream;
      this.buffer = new byte[BUFFER_SIZE];
      this.currentPosition = 0;
      this.numberOfChars = 0;
    }

    public int nextChar() {
      if (numberOfChars == -1) {
        throw new RuntimeException();
      }
      if (currentPosition >= numberOfChars) {
        currentPosition = 0;
        try {
          numberOfChars = stream.read(buffer);
        } catch (Exception e) {
          throw new RuntimeException(e);
        }
        if (numberOfChars <= 0) {
          return -1;
        }
      }
      return buffer[currentPosition++];
    }

  }

  static interface CharCollection {
    int size();

    default boolean isEmpty() {
      return size() == 0;
    }

  }

  static class CharArrayUtils {
    public static String toString(char[] values, int fromIdx, int toIdx) {
      StringBuilder sb = new StringBuilder("[");
      for (int i = fromIdx; i < toIdx; ++i) {
        if (i != fromIdx) sb.append(", ");
        sb.append(values[i]);
      }
      return sb.append("]").toString();
    }

  }

  static class CharArrayList implements CharCollection {
    private static final char[] EMPTY = {};
    public char[] values;
    public int size;

    public CharArrayList() {
      values = EMPTY;
      clear();
    }

    public CharArrayList(int capacity) {
      values = new char[Integer.highestOneBit(capacity) << 1];
      clear();
    }


    public void clear() {
      size = 0;
    }


    public int size() {
      return size;
    }


    public void add(char value) {
      ensureCapacity(size + 1);
      values[size++] = value;
    }

    public char get(int idx) {
      if (idx >= size) throw new ArrayIndexOutOfBoundsException();
      return values[idx];
    }


    public String toString() {
      return CharArrayUtils.toString(values, 0, size);
    }

    public void ensureCapacity(int capacity) {
      if (capacity <= values.length) return;
      char[] newValues = new char[Integer.highestOneBit(capacity) << 1];
      for (int i = 0; i < size; ++i) {
        newValues[i] = values[i];
      }
      values = newValues;
    }

  }
}