Problem: The only difference from the previous problem is the constraint on the number of requests. In this problem your program should guess the answer doing at most 7 requests.

This problem is a little bit unusual. Here you are to implement an interaction with a testing system. That means that you can make queries and get responses in the online mode. Please be sure to use the stream flushing operation after each query's output in order not to leave part of your output in some buffer. For example, in C++ you've got to use the fflush(stdout) function, in Java — call System.out.flush(), and in Pascal — flush(output).

Bulls and Cows (also known as Cows and Bulls or Pigs and Bulls or Bulls and Cleots) is an old code-breaking paper and pencil game for two players, predating the similar commercially marketed board game Mastermind.

On a sheet of paper, the first player thinks a secret string. This string consists only of digits and has the length 4. The digits in the string must be all different, no two or more equal digits are allowed.

Then the second player tries to guess his opponent's string. For every guess the first player gives the number of matches. If the matching digits are on their right positions, they are "bulls", if on different positions, they are "cows". Thus a response is a pair of numbers — the number of "bulls" and the number of "cows". A try can contain equal digits.

More formally, let's the secret string is s and the second player are trying to guess it with a string x. The number of "bulls" is a number of such positions i (1 ≤ i ≤ 4) where s[i] = x[i]. The number of "cows" is a number of such digits c that s contains c in the position i (i.e. s[i] = c), x contains c, but x[i] ≠ c.

For example, the secret string is "0427", the opponent's try is "0724", then the answer is 2 bulls and 2 cows (the bulls are "0" and "2", the cows are "4" and "7"). If the secret string is "0123", the opponent's try is "0330", then the answer is 1 bull and 1 cow.

In this problem you are to guess the string s that the system has chosen. You only know that the chosen string consists of 4 distinct digits.

You can make queries to the testing system, each query is the output of a single 4-digit string. The answer to the query is the number of bulls and number of cows. If the system's response equals "4 0", that means the interaction with your problem is over and the program must terminate. That is possible for two reasons — the program either guessed the number x or made an invalid action (for example, printed letters instead of digits).

Your program is allowed to do at most 7 queries.

You can hack solutions of other participants providing a 4-digit string containing distinct digits — the secret string.

Input

To read answers to the queries, the program must use the standard input.

The program will receive pairs of non-negative integers in the input, one pair per line. The first number in a pair is a number of bulls and the second one is a number of cows of the string s and the string xi printed by your program. If the system response equals "4 0", then your solution should terminate.

The testing system will let your program read the i-th pair of integers from the input only after your program displays the corresponding system query in the output: prints value xi in a single line and executes operation flush.

Output

The program must use the standard output to print queries.

Your program must output requests — 4-digit strings x1, x2, ..., one per line. After the output of each line the program must execute flush operation. The program should read the answer to the query from the standard input.

Your program is allowed to do at most 7 queries.

Examples

Input

0 1
2 0
1 1
0 4
2 1
4 0


Output

8000
0179
3159
3210
0112
0123

Note

The secret string s in the example is "0123".

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.Random;
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);
    TaskC solver = new TaskC();
    solver.solve(1, in, out);
    out.close();
  }

  static class TaskC {
    static Random RANDOM = new Random(1000000007);
    static int MAXN = 10000;
    int t;
    long[] aMask;
    int[] bMask;
    IntArrayList[] guess;
    int[][] cnt;

    public void solve(int testNumber, QuickScanner in, QuickWriter out) {
      t = 0;
      preprocess();
      while (true) {
        int res = calcGuess();
        out.printf("%04d\n", res);
        out.flush();
        int a = in.nextInt();
        int b = in.nextInt();
        if (a == 4) break;
        guess[t ^ 1].clear();
        for (int i = 0; i < guess[t].size; ++i) {
          int nextRes = guess[t].get(i);
          int nextA = Long.bitCount(aMask[res] & aMask[nextRes]);
          if (nextA != a) continue;
          int nextB = Integer.bitCount(bMask[res] & bMask[nextRes]) - nextA;
          if (nextB == b) {
            guess[t ^ 1].add(nextRes);
          }
        }
        t ^= 1;
      }
    }

    void preprocess() {
      aMask = new long[MAXN];
      bMask = new int[MAXN];
      guess = new IntArrayList[]{new IntArrayList(MAXN), new IntArrayList(MAXN)};
      for (int a = 0, i = 0; a < 10; ++a)
        for (int b = 0; b < 10; ++b)
          for (int c = 0; c < 10; ++c)
            for (int d = 0; d < 10; ++d) {
              aMask[i] = (1L << (a + 30)) | (1L << (b + 20)) | (1L << (c + 10)) | (1L << d);
              bMask[i] = (1 << a) | (1 << b) | (1 << c) | (1 << d);
              ++i;
            }
      for (int i = 0; i < MAXN; ++i)
        if (Integer.bitCount(bMask[i]) == 4) {
          guess[t].add(i);
        }
    }

    int calcGuess() {
      cnt = new int[5][5];
      int res = -1, resCnt = MAXN;
      for (int i = (guess[t].size > 1000 ? guess[t].size / 4 : guess[t].size) - 1, startIdx = 0; i >= 0; --i, ++startIdx) {
        int idx = RANDOM.nextInt(guess[t].size - startIdx) + startIdx;
        guess[t].swap(idx, startIdx);
        int x = guess[t].get(startIdx);
        for (int a = 0; a < cnt.length; ++a) Arrays.fill(cnt[a], 0);
        for (int j = 0; j < guess[t].size; ++j)
          if (i != j) {
            int y = guess[t].get(j);
            int a = Long.bitCount(aMask[x] & aMask[y]);
            int b = Integer.bitCount(bMask[x] & bMask[y]) - a;
            ++cnt[a][b];
          }
        int tmpCnt = 0;
        for (int a = 0; a < 5; ++a)
          for (int b = 0; b < 5; ++b) {
            tmpCnt = Math.max(tmpCnt, cnt[a][b]);
          }
        if (resCnt > tmpCnt) {
          res = x;
          resCnt = tmpCnt;
        }
      }
      if (res < 0) throw new IllegalArgumentException();
      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 printf(String format, Object... objects) {
      writer.printf(format, objects);
    }

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

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

  }

  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 nextInt() {
      int c = nextNonSpaceChar();
      boolean positive = true;
      if (c == '-') {
        positive = false;
        c = nextChar();
      }
      int res = 0;
      do {
        if (c < '0' || '9' < c) throw new RuntimeException();
        res = res * 10 + c - '0';
        c = nextChar();
      } while (!isSpaceChar(c));
      return positive ? res : -res;
    }

    public int nextNonSpaceChar() {
      int res = nextChar();
      for (; isSpaceChar(res) || res < 0; res = nextChar()) ;
      return res;
    }

    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++];
    }

    public boolean isSpaceChar(int c) {
      return c == ' ' || c == '\t' || isEndOfLineChar(c);
    }

    public boolean isEndOfLineChar(int c) {
      return c == '\n' || c == '\r' || c < 0;
    }

  }

  static interface IntCollection {
  }

  static class IntArrayUtils {
    public static void swap(int[] values, int uIdx, int vIdx) {
      if (uIdx == vIdx) return;
      values[uIdx] ^= values[vIdx];
      values[vIdx] ^= values[uIdx];
      values[uIdx] ^= values[vIdx];
    }

    public static String toString(int[] 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 IntArrayList implements IntCollection {
    private static int[] EMPTY = {};
    public int[] values;
    public int size;

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

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


    public void clear() {
      size = 0;
    }


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

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

    public void swap(int x, int y) {
      if (x >= size || y >= size) throw new ArrayIndexOutOfBoundsException();
      IntArrayUtils.swap(values, x, y);
    }


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

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

  }
}