#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;
using ld = long double;
using mint = modint998244353;
istream& operator>> (istream& is, mint& x) { long long _x; is >> _x; x = _x; return is; }
ostream& operator<< (ostream& os, const mint& x) { return os << x.val(); }
template<class T, class U>
ostream& operator<< (ostream& os, const pair<T, U>& x) { return os << "{" << x.first << ", " << x.second << "}"; }
#define int ll
#define OVERLOAD_REP(_1, _2, _3, name, ...) name
#define REP2(i, l, r) for (int i = (int)(l); i < (int)(r); ++i)
#define REP1(i, n) REP2(i, 0, n)
#define rep(...) OVERLOAD_REP(__VA_ARGS__, REP2, REP1)(__VA_ARGS__)
#define RREP2(i, r, l) for (int i = (int)(r)-1; i >= (int)(l); --i)
#define RREP1(i, n) RREP2(i, n, 0)
#define rrep(...) OVERLOAD_REP(__VA_ARGS__, RREP2, RREP1)(__VA_ARGS__)
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
#define pb push_back
#define mp make_pair
#define mt make_tuple
const int INF = 4e18;
const int MOD = 998244353;
const int MOD1 = 1e9 + 7;
template<class T> inline bool chmax(T &a, T b) { return a < b ? a = b, 1 : 0; }
template<class T> inline bool chmin(T &a, T b) { return a > b ? a = b, 1 : 0; }
template<class T> T pow(T a, T b, T m) { return b ? b&1 ? a*pow(a, b^1, m)%m : pow(a*a%m, b>>1, m)%m : 1; }
template<class T> T pow(T a, T b) { return b ? b&1 ? pow(a, b^1)*a : pow(a*a, b>>1) : 1; }
template<class... T> inline void input(T&... a) { ((cin >> a), ...); }
template<class T, class... U> inline void print(const T& a, const U&... b) { cout << a; ((cout << " " << b), ...); }
template<class T, class... U> inline void println(const T& a, const U&... b) { print(a, b...); cout << endl; }
inline void println() { cout << endl; }
template<class T> inline void print(vector<T>& A) { rep(i, A.size()) if (i) print("", A[i]); else print(A[i]); }
template<class T> inline void println(vector<T>& A) { print(A); cout << endl; }
const int di[8] = {-1, 0, 1, 0, -1, -1, 1, 1};
const int dj[8] = {0, -1, 0, 1, -1, 1, -1, 1};

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    
    int N;
    input(N);
    vector<mint> A(N);
    rep(i, N) input(A[i]);
    vector<vector<int>> G(N);
    rep(i, N-1) {
    	int U, V;
    	input(U, V);
    	--U; --V;
    	G[U].pb(V);
    	G[V].pb(U);
    }
    
    vector<mint> sum(N, 1);
    auto dfs = [&](auto dfs, int i, int par) -> void {
    	for (auto j : G[i]) {
    		if (j == par) continue;
    		dfs(dfs, j, i);
    		sum[i] += sum[j];
    	}
    	sum[i] *= A[i];
    };
    dfs(dfs, 0, -1);
    
    vector<mint> f(N);
    auto rerooting = [&](auto rerooting, int i, int par, mint p_sum) -> void {
    	f[i] = sum[i] + p_sum * A[i];
    	for (auto j : G[i]) {
    		if (j == par) continue;
    		rerooting(rerooting, j, i, sum[i] - sum[j] * A[i] + p_sum * A[i]);
    	}
    };
    rerooting(rerooting, 0, -1, 0);
    
    mint ans = 0;
    rep(i, N) ans += f[i] - A[i];
    println(ans / 2);
}