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 CPP):

Solution:
#include <bits/stdc++.h>
using namespace std;
const int N = 2e5 + 5;
int n, b[2][15], x, to_or, to_xor, to_and;
char ch;
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cin >> n;
  for (int i = 0; i < 10; i++) {
    b[1][i] = 1;
  }
  for (int i = 1; i <= n; i++) {
    cin >> ch >> x;
    for (int j = 0; j < 10; j++) {
      int bit = ((x >> j) & 1);
      if (ch == '^') {
        b[1][j] ^= bit;
        b[0][j] ^= bit;
      } else if (ch == '|') {
        b[1][j] |= bit;
        b[0][j] |= bit;
      } else {
        b[1][j] &= bit;
        b[0][j] &= bit;
      }
    }
  }
  for (int i = 0; i < 10; i++) {
    if (b[1][i] == 1 && b[0][i] == 1) {
      to_or += (1 << i);
    } else if (b[1][i] == 0 && b[0][i] == 1) {
      to_xor += (1 << i);
    } else if (b[1][i] == 0 && b[0][i] == 0) {
      to_or += (1 << i);
      to_xor += (1 << i);
    }
  }
  if (to_and != 0)
    cout << 3 << "\n"
         << "& " << to_and << "\n";
  else
    cout << 2 << "\n";
  cout << "| " << to_or << "\n";
  cout << "^ " << to_xor;
}