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.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.StringTokenizer;

public class A {
	
	public static void main(String[] args) throws IOException{
		Scanner sc = new Scanner(System.in);
		PrintWriter out = new PrintWriter(System.out);
		int n = sc.nextInt();
		int[] ans = new int[10];
		Arrays.fill(ans, -1);
		for(int i = 0; i < n; i++)
		{
			char op = sc.nextChar();
			int x = sc.nextInt();
			for(int j = 0; j < 10; j++)
			{
				int bit = ((1 << j) & x) == 0? 0 : 1;
				if(op == '&' && bit == 0)
					ans[j] = 0;
				if(op == '|' && bit == 1)
					ans[j] = 1;
				if(op == '^' && bit == 1)
					if(ans[j] == 2) ans[j] = -1;
					else if(ans[j] == -1) ans[j] = 2;
					else ans[j] ^= 1; 
			}
		}
		int and = 1023, or = 0, xor = 0;
		for(int i = 0; i < 10; i++)
			if(ans[i] == 0)
				and &= ~(1 << i);
			else if(ans[i] == 1)
				or |= (1 << i);
			else if(ans[i] == 2)
				xor |= (1 << i);
		
		out.println(3);
		out.println("& " + and);
		out.println("| " + or);
		out.println("^ " + xor);
		out.flush();
		out.close();
	}
	
	static class Scanner 
	{
		StringTokenizer st;
		BufferedReader br;

		Scanner(InputStream system) {br = new BufferedReader(new InputStreamReader(system));}
		Scanner(String file) throws FileNotFoundException {br = new BufferedReader(new FileReader(file));}
		String next() throws IOException 
		{
			while (st == null || !st.hasMoreTokens()) 
				st = new StringTokenizer(br.readLine());
			return st.nextToken();
		}
		String nextLine()throws IOException{return br.readLine();}
		int nextInt() throws IOException {return Integer.parseInt(next());}
		double nextDouble() throws IOException {return Double.parseDouble(next());}
		char nextChar()throws IOException{return next().charAt(0);}
		Long nextLong()throws IOException{return Long.parseLong(next());}
		boolean ready() throws IOException{return br.ready();}
		void waitForInput(){for(long i = 0; i < 3e9; i++);}
	}
}