Problem: Petya learned a new programming language CALPAS. A program in this language always takes one non-negative integer and returns one non-negative integer as well.

In the language, there are only three commands: apply a bitwise operation AND, OR or XOR with a given constant to the current integer. A program can contain an arbitrary sequence of these operations with arbitrary constants from 0 to 1023. When the program is run, all operations are applied (in the given order) to the argument and in the end the result integer is returned.

Petya wrote a program in this language, but it turned out to be too long. Write a program in CALPAS that does the same thing as the Petya's program, and consists of no more than 5 lines. Your program should return the same integer as Petya's program for all arguments from 0 to 1023.

Input

The first line contains an integer n (1 ≤ n ≤ 5·105) — the number of lines.

Next n lines contain commands. A command consists of a character that represents the operation ("&", "|" or "^" for AND, OR or XOR respectively), and the constant xi 0 ≤ xi ≤ 1023.

Output

Output an integer k (0 ≤ k ≤ 5) — the length of your program.

Next k lines must contain commands in the same format as in the input.

Examples

Input

3
| 3
^ 2
| 1


Output

2
| 3
^ 2


Input

3
&amp; 1
&amp; 3
&amp; 5


Output

1
&amp; 1


Input

3
^ 1
^ 2
^ 3


Output

0

Note

You can read about bitwise operations in <https://en.wikipedia.org/wiki/Bitwise_operation>.

Second sample:

Let x be an input of the Petya's program. It's output is ((x&1)&3)&5 = x&(1&3&5) = x&1. So these two programs always give the same outputs.

Solution (in JAVA):

Solution:
import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.StringTokenizer;
import java.util.HashMap;
import java.io.IOException;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.InputStream;

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

    static class TaskC {
        public void solve(int testNumber, InputReader in, PrintWriter out) {
            int n = in.nextInt();
            int resWithZero = 0, resWithOne = 1023;
            while (n-- > 0) {
                String operator = in.next();
                int operand = in.nextInt();
                if (operator.equals("|")) {
                    resWithZero |= operand;
                    resWithOne |= operand;
                } else if (operator.equals("^")) {
                    resWithZero ^= operand;
                    resWithOne ^= operand;
                } else {
                    resWithZero &= operand;
                    resWithOne &= operand;
                }
            }
            int toOr = 0, toXor = 0, toAnd = 1023;
            for (int i = 0; i < 10; i++) {
                int bitWithZero = (resWithZero >> i) & 1;
                int bitWithOne = (resWithOne >> i) & 1;
                if (bitWithZero == 1 && bitWithOne == 0) {
                    toXor |= (1 << i);
                } else if (bitWithZero == 1 && bitWithOne == 1) {
                    toOr |= (1 << i);
                } else if (bitWithZero == 0 && bitWithOne == 0) {
                    toAnd ^= (1 << i);
                }
            }
            HashMap<String, Integer> resultSet = new HashMap<>();
            if (toOr != 0) {
                resultSet.put("|", toOr);
            }
            if (toXor != 0) {
                resultSet.put("^", toXor);
            }
            if (toAnd != 1023) {
                resultSet.put("&", toAnd);
            }
            out.println(resultSet.size());
            for (String operator : resultSet.keySet()) {
                out.print(operator);
                out.print(" ");
                out.println(resultSet.get(operator));
            }
        }

    }

    static class InputReader {
        public BufferedReader reader;
        public StringTokenizer tokenizer;

        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        }

        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }

        public int nextInt() {
            return Integer.parseInt(next());
        }

    }
}