#include <atcoder/all>
#include <bits/stdc++.h>

using namespace std;
using namespace atcoder;

#ifdef DEBUG
#include "debug/all.hpp"
#else
#define debug(...) 42
#endif

using ll = long long;
using ull = unsigned long long;
using ld = long double;
using P = pair<ll, ll>;
using tp = tuple<ll, ll, ll>;

template <class T>
using vec = vector<T>;
template <class T>
using vvec = vector<vec<T>>;

#define all(hoge) (hoge).begin(), (hoge).end()
#define en '\n'
#define rep(i, m, n) for(ll i = (ll)(m); i < (ll)(n); ++i)
#define rep2(i, m, n) for(ll i = (ll)(n)-1; i >= (ll)(m); --i)
#define REP(i, n) rep(i, 0, n)
#define REP2(i, n) rep2(i, 0, n)

constexpr long long INF = 1LL << 60;
constexpr int INF_INT = 1 << 30;
// constexpr long long MOD = (ll)1e9 + 7;
constexpr long long MOD = 998244353LL;
static const ld pi = 3.141592653589793L;

template <class T>
inline bool chmin(T &a, T b) {
    if(a > b) {
        a = b;
        return true;
    }
    return false;
}

template <class T>
inline bool chmax(T &a, T b) {
    if(a < b) {
        a = b;
        return true;
    }
    return false;
}

struct Edge {
    int to, rev;
    ll cap;
    Edge(int _to, int _rev, ll _cap) : to(_to), rev(_rev), cap(_cap) {}
};

typedef vector<Edge> Edges;
typedef vector<Edges> Graph;

void add_edge(Graph &G, int from, int to, ll cap, bool revFlag, ll revCap) {
    G[from].push_back(Edge(to, (int)G[to].size(), cap));
    if(revFlag)
        G[to].push_back(Edge(from, (int)G[from].size() - 1, revCap));
}

template <typename E, typename F, typename PE, typename PV>
class RerootingDP {
  private:
    int n;
    E id;
    F merge;
    PE put_edge;
    PV put_vertex;
    Graph g;
    vector<E> subdp;
    vector<E> dp;

  public:
    vector<E> ans;

    RerootingDP(Graph _g, E _id, F f, PE pe, PV pv, int root = 0) : n(_g.size()), g(_g), id(_id), merge(f), put_edge(pe), put_vertex(pv), subdp(n, _id), dp(n, _id), ans(n, _id) {
        build(root);
        reroot(root);
    }

    void build(int root) {
        auto dfs = [&](auto &&self, int v, int p) -> void {
            E val = id;
            for(auto e : g[v]) {
                if(e.to == p)
                    continue;
                self(self, e.to, v);
                E nval = put_edge(subdp[e.to], e);
                val = merge(val, nval);
            }
            subdp[v] = put_vertex(val, v);
        };
        dfs(dfs, root, -1);
    }
    void reroot(int root) {
        auto dfs = [&](auto &&self, int v, int p, E pval) -> void {
            vec<E> as;
            for(auto e : g[v]) {
                if(e.to == p) {
                    as.push_back(put_edge(pval, e));
                } else {
                    as.push_back(put_edge(subdp[e.to], e));
                }
            }
            vec<E> al(as.size(), as[0]);
            REP(i, as.size() - 1) {
                al[i + 1] = merge(as[i + 1], al[i]);
            }
            vec<E> ar(as.size(), as.back());
            REP2(i, as.size() - 1) {
                ar[i] = merge(as[i], ar[i + 1]);
            }
            dp[v] = merge(dp[v], put_vertex(al.back(), v));
            ans[v] = dp[v];
            int k = 0;
            for(auto e : g[v]) {
                if(e.to == p) {
                    k++;
                    continue;
                }
                E val = id;
                if(k - 1 >= 0)
                    val = merge(val, al[k - 1]);
                if(k + 1 < ar.size())
                    val = merge(val, ar[k + 1]);
                val = put_vertex(val, v);
                self(self, e.to, v, val);
                k++;
            }
        };
        dfs(dfs, root, -1, id);
    }
};

void solve() {
    ll n;
    cin >> n;
    vec<string> a(n);
    REP(i, n) { cin >> a[i]; }

    Graph g(n);
    REP(i, n - 1) {
        int u, v;
        cin >> u >> v;
        u--;
        v--;
        add_edge(g, u, v, 1, true, 1);
    }

    using mint = modint998244353;
    struct S {
        mint sum;
        mint con;
        S(mint _sum, mint _con) : sum(_sum), con(_con) {}
        S() : sum(0), con(0) {}
    };
    S id = S();
    auto merge = [](S a, S b) -> S { return S(a.sum + b.sum, a.con + b.con); };
    auto put_edge = [](S val, Edge e) { return val; };
    auto put_vertex = [&](S val, int v) {
        // cout << v << ":" << val.sum.val() << " " << val.con.val() << en;
        mint con = val.con + 1;
        mint sum = val.sum * mint(10).pow(a[v].size()) + con * stoll(a[v]);
        // cout << sum.val() << " " << con.val() << en;
        return S(sum, con);
    };
    RerootingDP rdp(g, id, merge, put_edge, put_vertex);
    auto dp = rdp.ans;
    mint ans = 0;
    for(auto i : dp) {
        ans += i.sum;
    }
    cout << ans.val() << en;
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    // cout << fixed << setprecision(10);

    // ll t;
    // cin >> t;
    // REP(i, t - 1) {
    //     solve();
    // }

    solve();

    return 0;
}