#include <bits/stdc++.h>
using namespace std;
const long long MOD = 998244353;
int main(){
  int N;
  cin >> N;
  vector<string> A(N);
  for (int i = 0; i < N; i++){
    cin >> 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<long long> B(N), C(N);
  for (int i = 0; i < N; i++){
    B[i] = 1;
    for (int j = 0; j < A[i].size(); j++){
      B[i] *= 10;
      B[i] %= MOD;
    }
    C[i] = stoll(A[i]) % MOD;
  }
  vector<int> p(N, -1);
  vector<vector<int>> c(N);
  vector<int> b;
  queue<int> Q;
  Q.push(0);
  while (!Q.empty()){
    int v = Q.front();
    Q.pop();
    b.push_back(v);
    for (int w : E[v]){
      if (w != p[v]){
        p[w] = v;
        c[v].push_back(w);
        Q.push(w);
      }
    }
  }
  reverse(b.begin(), b.end());
  vector<int> dp1(N, 0);
  vector<long long> dp2(N, 0);
  for (int v : b){
    dp1[v] = 1;
    for (int w : c[v]){
      dp1[v] += dp1[w];
      dp2[v] += dp2[w];
      dp2[v] %= MOD;
    }
    dp2[v] *= B[v];
    dp2[v] %= MOD;
    dp2[v] += C[v] * dp1[v];
    dp2[v] %= MOD;
  }
  reverse(b.begin(), b.end());
  vector<long long> dp3(N, 0);
  dp3[0] = C[0];
  for (int v : b){
    long long sum = 0;
    for (int w : c[v]){
      sum += dp2[w];
    }
    if (v != 0){
      sum += dp3[p[v]];
    }
    sum %= MOD;
    for (int w : c[v]){
      long long sum2 = (sum - dp2[w] + MOD) % MOD;
      sum2 *= B[v];
      sum2 %= MOD;
      sum2 += C[v] * (N - dp1[w]);
      sum2 %= MOD;
      sum2 *= B[w];
      sum2 %= MOD;
      sum2 += C[w] * (N - dp1[w] + 1);
      sum2 %= MOD;
      dp3[w] = sum2;
    }
  }
  long long ans = 0;
  for (int i = 0; i < N; i++){
    ans += dp2[i] + dp3[i] - C[i] + MOD;
    ans %= MOD;
  }
  cout << ans << endl;
}