#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
//using mint = modint1000000007;
//const int mod = 1000000007;
using mint = modint998244353;
const int mod = 998244353;
//const int INF = 1e9;
//const long long LINF = 1e18;
//const bool debug = false;
#define rep(i, n) for (int i = 0; i < (n); ++i)
#define rep2(i,l,r)for(int i=(l);i<(r);++i)
#define rrep(i, n) for (int i = (n-1); i >= 0; --i)
#define rrep2(i,l,r)for(int i=(r-1);i>=(l);--i)
#define all(x) (x).begin(),(x).end()
#define allR(x) (x).rbegin(),(x).rend()
#define endl "\n"
#define P pair<long long,long long>
template<typename A, typename B> inline bool chmax(A & a, const B & b) { if (a < b) { a = b; return true; } return false; }
template<typename A, typename B> inline bool chmin(A & a, const B & b) { if (a > b) { a = b; return true; } return false; }
vector<mint> pw10(21);
struct ReRooting {
	struct Value {
		mint val;
		int sz;
		Value() :val(0), sz(0) {}
		Value(mint _val, int _sz) :val(_val), sz(_sz) {}
	};
	struct Data {
		mint val;
		mint cnt;
		Data() :val(0), cnt(0) {}
		Data(mint _val, mint _cnt) :val(_val), cnt(_cnt) {}
	};
	vector<vector<int>>to;
	vector<Data>dp;
	vector<Data>ans;
	vector<Value>data;
	int sz;
	ReRooting(int _sz) :sz(_sz) {
		to.resize(sz);
		dp.reserve(sz);
		ans.resize(sz);
		data.resize(sz);
	}
	void ReadData() {
		rep(i, sz) {
			string s; cin >> s;
			data[i] = { stoll(s),(int)s.size() };
		}
	}
	void ReadGraph() {
		rep(i, sz - 1) {
			int a, b; cin >> a >> b; a--; b--;
			to[a].push_back(b);
			to[b].push_back(a);
		}
	}
	Data merge(const Data &lh, const Data &rh, int idx) {
		Data ret = lh;
		ret.cnt += rh.cnt;
		ret.val += rh.val * pw10[data[idx].sz];
		ret.val += data[idx].val * rh.cnt;
		return ret;
	}
	Data mergeR(const Data &lh, const Data &rh, int idx) {
		Data ret = lh;
		ret.cnt -= rh.cnt;
		ret.val -= rh.val * pw10[data[idx].sz];
		ret.val -= data[idx].val * rh.cnt;
		return ret;
	}
	void dfs(int v, int p = -1) {
		Data val = { data[v].val,1 };
		for (auto nv : to[v]) {
			if (p == nv)continue;
			dfs(nv, v);
			val = merge(val, dp[nv], v);
		}
		dp[v] = val;
	}
	void dfsR(int v, int p = -1) {
		ans[v] = dp[v];
		if (-1 != p)ans[v] = merge(ans[v], dp[p], v);
		for (auto nv : to[v]) {
			if (p == nv)continue;
			dp[v] = mergeR(ans[v], dp[nv], v);
			dfsR(nv, v);
		}
	}
	void output() {
		mint result = 0;
		rep(i, sz)result += ans[i].val;
		cout << result.val() << endl;
	}
	void solve() {
		ReadData();
		ReadGraph();
		dfs(0);
		dfsR(0);
		output();
	}
};
int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	pw10[0] = 1;
	rep(i, 20) pw10[i + 1] = pw10[i] * 10;
	int n; cin >> n;
	ReRooting reroot(n);
	reroot.solve();
	return 0;
}