#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using mint = modint998244353;

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n, u, v;
    cin >> n;
    vector<mint> a(n);
    for(int i = 0; i < n; i++){
        cin >> v;
        a[i] = v;
    }
    vector<pair<int,int>> edge(2 * (n - 1));
    for(int i = 0; i + 1 < n; i++){
        cin >> u >> v;
        edge[2 * i] = make_pair(--u, --v);
        edge[2 * i + 1] = make_pair(v, u);
    }
    internal::csr<int> g(n, edge);
    mint ans;
    auto dfs = [&](auto dfs, int v, int p = -1) -> mint {
        mint s0, s1;
        for(int i = g.start[v]; i < g.start[v + 1]; i++) {
            int u = g.elist[i];
            if(u == p) continue;
            auto rc = dfs(dfs, u, v);
            s1 += s0 * rc;
            s0 += rc;
        }
        ans += (s0 + s1) * a[v];
        return ++s0 * a[v];
    };
    dfs(dfs, 0);
    cout << ans.val() << '\n';
}