#include <bits/stdc++.h>
using namespace std;

template <class T> using V = vector<T>;
template <class T> using VV = V<V<T>>;

using ll = int64_t;

template <class F> struct ycr { /// start-hash
	F f;
	template <class T> explicit ycr(T&& f_) : f(forward<T>(f_)) {}

	template <class... A> decltype(auto) operator()(A&&... as) {
		return f(ref(*this), forward<A>(as)...);
	}
};
template <class F> decltype(auto) yc(F&& f) {
	return ycr<decay_t<F>>(forward<F>(f));
} /// end-hash

// 0, ..., K-1
template <int K> struct Eertree {
	struct Node {
		array<int, K> ch;
		int fail;
		int l, r; // location of the first ocurrence
		Node(int f_, int l_, int r_) : ch{}, fail(f_), l(l_), r(r_) {}
		int len() const { return r-l; }
	};
	V<Node> x;
	V<int> buf;
	int cur;
	Eertree(int alloc = 0) {
		if (alloc) {
			x.reserve(alloc+2);
			buf.reserve(alloc);
		}
		x.emplace_back(-1, 1, 0);
		x.emplace_back(0, 0, 0);
		reset();
	}

	void reset() {
		cur = 1;
		buf.clear();
	}

	int append(int a) {
		int i = int(buf.size());
		buf.push_back(a);
		auto works = [&](int v) -> bool {
			int l = i - x[v].len();
			return l > 0 && buf[l-1] == a;
		};
		for (; !works(cur); cur = x[cur].fail) {}
		if (!x[cur].ch[a]) {
			int par = x[cur].fail;
			if (par != -1) {
				for (; !works(par); par = x[par].fail) {}
			}
			int npar = (par == -1 ? 1 : x[par].ch[a]);
			x[cur].ch[a] = int(x.size());
			x.emplace_back(npar, i - x[cur].len() - 1, i + 1);
		}
		assert(x[cur].ch[a]);
		cur = x[cur].ch[a];
		return cur;
	}

	int size() const {
		return int(x.size());
	}
	const Node& operator [](int i) const {
		return x[i];
	}
};

int main() {
	ios_base::sync_with_stdio(false), cin.tie(nullptr);

	int N;
	cin >> N;
	string S;
	cin >> S;

	S += S;

	Eertree<10> et(2 * N);
	V<int> locs; locs.reserve(2 * N);
	for (char c : S) {
		int v = int(c - '0');
		assert(0 <= v && v < 10);
		locs.push_back(et.append(v));
	}

	int nnodes = et.size();
	V<int> f_before(nnodes);
	V<int> f_all(nnodes);
	for (int i = 0; i < N; i++) {
		int v = locs[i];
		f_before[v]++;
		f_all[v]++;
	}
	for (int i = N; i < 2*N; i++) {
		int v = locs[i];
		f_all[v]++;
	}
	for (int v = nnodes-1; v >= 1; v--) {
		int p = et[v].fail;
		f_before[p] += f_before[v];
		f_all[p] += f_all[v];
	}

	const ll MOD = 998244353;
	ll ans = 0;
	for (int v : locs) {
		int len = et[v].len();
		if (len <= N) {
			ll f_cyc = f_all[v] - f_before[v];
			f_cyc %= MOD;
			ll val = len * ll(f_cyc) % MOD * f_cyc % MOD;
			ans += val;
		}
	}
	ans %= MOD;
	cout << ans << '\n';

	return 0;
}