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 ≤ 5·10^5) — 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 x_{i} 0 ≤ x_{i} ≤ 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
& 1
& 3
& 5

Output
1
& 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.

```python

USER_FILENAME = "<user_code>"
import sys, json, builtins
import math, heapq, bisect, itertools, functools, collections, statistics, fractions, decimal, operator, array, random, re, string, os, pathlib
try:
    import resource as _res
except Exception:
    _res = None
from collections import Counter, defaultdict, deque, OrderedDict
from functools import lru_cache, reduce
from itertools import accumulate, permutations, combinations, product
from math import gcd, ceil, floor, sqrt
from decimal import Decimal
try:
    from typing import *
except Exception:
    pass
try:
    sys.setrecursionlimit(1_000_000)
except Exception:
    pass
try:
    import site as _site
    try:
        _sys_sites = _site.getsitepackages() if hasattr(_site, "getsitepackages") else []
        for _p in _sys_sites:
            if _p and _p not in sys.path:
                sys.path.append(_p)
    except Exception:
        pass
    try:
        _usp = _site.getusersitepackages()
        if isinstance(_usp, str):
            _usp = [_usp]
        for _p in _usp:
            if _p and _p not in sys.path:
                sys.path.append(_p)
    except Exception:
        pass
except Exception:
    pass

ns = {"__name__": "__main__"}
for _k, _v in list(globals().items()):
    if not _k.startswith("_"):
        ns[_k] = _v
_CODE = "import sys\nimport heapq\nimport math\nfrom enum import Enum\n\nclass Status:\n    UNTOUCHED = 1\n    FLIPPED = 2\n    ONE = 3\n    ZERO = 4\n\nbits = [Status.UNTOUCHED]*10\nlines = sys.stdin.read().splitlines()\n\nn = int(lines[0])\n\nandNum = 1023\norNum = 0\nxorNum = 0\nfor i in range(1, n+1):\n    # print(andNum)\n    # print(orNum)\n    # print(xorNum)\n\n    operation, num = lines[i].split(' ')\n    num = int(num)\n    # print(num)\n    # print('----')\n    if operation == '|':\n        andNum=andNum|num\n        orNum=orNum|num\n        xorNum=xorNum&(orNum^1023)\n    elif operation == '&':\n        andNum=andNum&num\n        orNum=orNum&num\n        xorNum=xorNum&num\n    else:\n        # Flip all ones to zeroes and flip untouched\n        # All bits that were set to 1 in OR mask and 1 in num, should be set to 0 in AND mask\n        # All bits that were set to 0 in AND mask and 1 in num, should be set to 1 in OR mask\n        # All those bits that were not set to 0 in AND mask and not set to 1 in OR mask should be set to 1 in xor MASK\n        oldAndNum=andNum\n        oldOrNum=orNum\n        andNum=andNum^((orNum|(andNum^1023))&num)\n        orNum=orNum^(((oldAndNum^1023)|(orNum))&num)\n        xorNum=xorNum^(oldAndNum&(oldOrNum^1023)&num)\n\n# OR\nprint(3)\nprint('& '+str(andNum))\nprint('| '+str(orNum))\nprint('^ '+str(xorNum))\n\n\n\n"
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

```

Measured memory_bytes: 15977