#include <bits/stdc++.h>
using namespace std;
void shoot() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
}
long long power(long long n, long long pwr) {
  long long ans = 1LL;
  while (pwr) {
    if (pwr & 1) ans = (ans * n) % 998244353;
    n = (n * n) % 998244353;
    pwr >>= 1;
  }
  return ans;
}
struct custom_hash {
  static uint64_t splitmix64(uint64_t x) {
    x += 0x9e3779b97f4a7c15;
    x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
    x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
    return x ^ (x >> 31);
  }
  size_t operator()(uint64_t x) const {
    static const uint64_t FIXED_RANDOM =
        chrono::steady_clock::now().time_since_epoch().count();
    return splitmix64(x + FIXED_RANDOM);
  }
};
int main() {
  shoot();
  long long i, x = 0, n, ans = 1;
  cin >> n;
  long long a[n];
  unordered_map<long long, long long, custom_hash> mp;
  for (i = 0; i < n; i++) {
    cin >> a[i];
    mp[a[i]] = i;
  }
  for (i = 0; i < n; i++) {
    if (i > x) ans = (ans << 1) % 998244353;
    x = max(x, mp[a[i]]);
  }
  cout << ans;
  return 0;
}
