#include<bits/stdc++.h>
#include<atcoder/modint>
using namespace std;
using namespace atcoder;
using mint = modint998244353;
int main() {
  int N;
  cin >> N;
  vector<string> A(N);
  for (int i = 0; i < N; i++) {
    cin >> A[i];
  }
  vector<mint> B(N), C(N);
  for (int i = 0; i < N; i++) {
    B[i] = 1;
    for (int j = 0; j < (int) A[i].size(); j++) {
      B[i] *= 10;
    }
    C[i] = mint(stoll(A[i]));
  }
  vector<vector<int>> E(N);
  for (int i = 0; i < N - 1; i++) {
    int u, v;
    cin >> u >> v;
    u--;
    v--;
    E[u].push_back(v);
    E[v].push_back(u);
  }
  vector<vector<int>> c(N);
  vector<int> p(N, -1);
  vector<int> bfs;
  queue<int> Q;
  Q.push(0);
  while (!Q.empty()) {
    int v = Q.front();
    Q.pop();
    bfs.push_back(v);
    for (int w : E[v]) {
      if (w != p[v]) {
        p[w] = v;
        c[v].push_back(w);
        Q.push(w);
      }
    }
  }
  reverse(bfs.begin(), bfs.end());
  vector<int> dp1(N);
  vector<mint> dp2(N);
  for (int v : bfs) {
    dp1[v]++;
    for (int w : c[v]) {
      dp1[v] += dp1[w];
      dp2[v] += dp2[w];
    }
    dp2[v] *= B[v];
    dp2[v] += C[v] * dp1[v];
  }
  reverse(bfs.begin(), bfs.end());
  vector<mint> dp3(N);//dp3[0] = 0;
  for (int v : bfs) {
    mint sum = 0;
    for (int w : c[v]) {
      sum += dp2[w];
    }
    for (int w : c[v]) {
      mint sum2 = sum;
      sum2 -= dp2[w];
      sum2 *= B[v];
      sum2 += C[v] * (dp1[v] - dp1[w]);
      sum2 += dp3[v];
      sum2 *= B[w];
      sum2 += C[w] * (N - dp1[w]);
      dp3[w] = sum2;
    }
  }
  mint ans = 0;
  for (int i = 0; i < N; i++) {
    ans += dp2[i] + dp3[i];
  }
  cout << ans.val() << endl;
}