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 MAXN = 5e5 + 4;
char op[5];
int n, bits[10], cst, xAdd[10];
int main() {
  for (int i = 0; i < 10; ++i) {
    bits[i] = -1;
    xAdd[i] = 0;
  }
  scanf("%d", &n);
  for (int i = 0; i < n; ++i) {
    scanf("%s%d", op, &cst);
    if (*op == '|') {
      for (int j = 0; j < 10; ++j)
        if ((1 << j) & cst) bits[j] = 1;
    } else if (*op == '&') {
      for (int j = 0; j < 10; ++j)
        if (!((1 << j) & cst)) bits[j] = 0;
    } else {
      for (int j = 0; j < 10; ++j) {
        if (!((1 << j) & cst)) continue;
        if (bits[j] >= 0) {
          if (bits[j] == 1)
            bits[j] = 0;
          else
            bits[j] = 1;
        } else {
          xAdd[j] ^= 1;
        }
      }
    }
  }
  int orNum = 0, xorNum = 0, andNum = 0;
  for (int i = 0; i < 10; ++i) {
    if (bits[i] < 0) {
      andNum |= (1 << i);
      if (xAdd[i] == 1) xorNum |= (1 << i);
    }
    if (bits[i] == 1) orNum |= (1 << i);
  }
  printf("%d\n", 3);
  printf("& %d\n", andNum);
  printf("| %d\n", orNum);
  printf("^ %d\n", xorNum);
  return 0;
}