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;
void solve() {
  int n;
  cin >> n;
  vector<char> ops(n);
  vector<int> vals(n);
  for (int i = 0; i < n; i++) {
    cin >> ops[i] >> vals[i];
  }
  int mx = pow(2, 11) - 1, mn = 0;
  for (int i = 0; i < n; i++) {
    if (ops[i] == '|') {
      mx |= vals[i];
      mn |= vals[i];
    } else if (ops[i] == '&') {
      mx &= vals[i];
      mn &= vals[i];
    } else {
      mx ^= vals[i];
      mn ^= vals[i];
    }
  }
  int and_val = 0, or_val = 0, xor_val = 0;
  for (int i = 0; i < 10; i++) {
    if ((mx & (1 << i)) && !(mn & (1 << i))) {
      and_val |= (1 << i);
      continue;
    }
    if ((mx & (1 << i)) && (mn & (1 << i))) {
      and_val |= (1 << i);
      or_val |= (1 << i);
    } else if ((mx & (1 << i)) == 0 && (mn & (1 << i))) {
      and_val |= (1 << i);
      xor_val |= (1 << i);
    }
  }
  cout << 3 << endl;
  cout << "& " << and_val << endl;
  cout << "| " << or_val << endl;
  cout << "^ " << xor_val << endl;
}
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int t = 1;
  while (t--) {
    solve();
  }
}