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 long long mod = 1e9 + 7;
long long dx[] = {-1, 0, 1, 0};
long long dy[] = {0, -1, 0, 1};
int32_t main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  vector<long long> v(10, 2);
  long long n;
  cin >> n;
  for (long long i = 0; i < n; i++) {
    long long x;
    char c;
    cin >> c >> x;
    if (c == '^') {
      for (long long j = 0; j < 10; j++) {
        if (x & (1 << j)) v[j] ^= 1;
      }
    } else if (c == '&') {
      for (long long j = 0; j < 10; j++) {
        if ((x & (1 << j)) == 0) v[j] = 0;
      }
    } else {
      for (long long j = 0; j < 10; j++)
        if (x & (1 << j)) v[j] = 1;
    }
  }
  cout << 3 << '\n';
  long long x = 1023, y = 0, z = 0;
  for (long long i = 0; i < 10; i++) {
    if (v[i] == 0) {
      x ^= (1 << i);
    } else if (v[i] == 1) {
      y |= (1 << i);
    } else if (v[i] == 3) {
      z ^= (1 << i);
    }
  }
  cout << "& " << x << "\n";
  cout << "| " << y << "\n";
  cout << "^ " << z << "\n";
}