Iahub is very proud of his recent discovery, propagating trees. Right now, he invented a new tree, called xor-tree. After this new revolutionary discovery, he invented a game for kids which uses xor-trees.

The game is played on a tree having n nodes, numbered from 1 to n. Each node i has an initial value init_{i}, which is either 0 or 1. The root of the tree is node 1.

One can perform several (possibly, zero) operations on the tree during the game. The only available type of operation is to pick a node x. Right after someone has picked node x, the value of node x flips, the values of sons of x remain the same, the values of sons of sons of x flips, the values of sons of sons of sons of x remain the same and so on.

The goal of the game is to get each node i to have value goal_{i}, which can also be only 0 or 1. You need to reach the goal of the game by using minimum number of operations.


-----Input-----

The first line contains an integer n (1 ≤ n ≤ 10^5). Each of the next n - 1 lines contains two integers u_{i} and v_{i} (1 ≤ u_{i}, v_{i} ≤ n; u_{i} ≠ v_{i}) meaning there is an edge between nodes u_{i} and v_{i}. 

The next line contains n integer numbers, the i-th of them corresponds to init_{i} (init_{i} is either 0 or 1). The following line also contains n integer numbers, the i-th number corresponds to goal_{i} (goal_{i} is either 0 or 1).


-----Output-----

In the first line output an integer number cnt, representing the minimal number of operations you perform. Each of the next cnt lines should contain an integer x_{i}, representing that you pick a node x_{i}.


-----Examples-----
Input
10
2 1
3 1
4 2
5 1
6 2
7 5
8 6
9 8
10 5
1 0 1 1 0 1 0 1 0 1
1 0 1 0 0 1 1 1 0 1

Output
2
4
7

```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 = 'from collections import defaultdict, deque, Counter, OrderedDict\nfrom bisect import insort, bisect_right, bisect_left\nimport threading\n\ndef main():\n    n = int(input())\n    adj = [[] for i in range(n + 1)]\n    for i in range(n - 1):\n        a, b = list(map(int, input().split()))\n        a, b = a - 1, b - 1\n        adj[a].append(b)\n        adj[b].append(a)\n    init = [int(i) for i in input().split()]\n    goal = [int(i) for i in input().split()]\n    visited = [0] * n\n    par = [[] for i in range(n)]\n    dq = deque()\n    dq.append((0, 0))\n    while len(dq) > 0:\n        (s, p) = dq.pop()\n        if visited[s]: continue\n        visited[s] = 1\n        par[p].append(s)\n        for i in adj[s]:\n            dq.append((i, s))\n    par[0] = par[0][1:]\n    ans = []\n    dq = deque()\n    dq.append((0, 0, 0, 0))\n    while len(dq) > 0:\n        (s, l, fo, fe) = dq.pop()\n        if l % 2 == 0:\n            if fe % 2 == 1:\n                init[s] = 1 - init[s]\n        else:\n            if fo % 2 == 1:\n                init[s] = 1 - init[s]\n        if init[s] != goal[s]:\n            ans.append(s + 1)\n            if l % 2:\n                fo += 1\n            else:\n                fe += 1\n        for j in par[s]:\n            dq.append((j, l + 1, fo, fe))\n\n    print(len(ans))\n    print("\\n".join(map(str, ans)))\n\ndef __starting_point():\n    """sys.setrecursionlimit(200000)\n    threading.stack_size(10240000)"""\n    thread = threading.Thread(target=main)\n    thread.start()\n\n__starting_point()'
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

```

Measured memory_bytes: 245285