#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using mint = atcoder::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<vector<int>> g(n);
    for(int i = 1; i < n; i++){
        cin >> u >> v;
        g[--u].emplace_back(--v);
        g[v].emplace_back(u);
    }
    mint ans;
    auto dfs = [&](auto dfs, int v, int p = -1) -> mint {
        mint s0, s1;
        for(auto &&u : g[v]){
            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';
}