// kでループ、ペアを全探索 (その2)
#include <bits/stdc++.h>
#define FOR(i,k,n)  for(int i = (k);i < (n);++i)
#define REP(i,n)    FOR(i,0,n)
#define ALL(x)      begin(x),end(x)

using namespace std;
using vecint = vector<int>;
using ll = int64_t;
using vecll = vector<ll>;

constexpr ll MOD = 998244353;
constexpr ll MAX_F = 600000;

// a^-1 mod p
ll inv(ll a,ll p){
  return ( a == 1 ? 1 : (1 - p*inv(p%a,a)) / a + p );
}

int main() {
  vecll fact(MAX_F+1), finv(MAX_F+1);
  fact[0] = 1;
  REP(i,MAX_F) {
    fact[i+1] = fact[i] * (i+1) % MOD;
  }
  finv[MAX_F] = inv(fact[MAX_F], MOD);
  REP(ri,MAX_F) {
    int i = MAX_F - ri;
    finv[i-1] = finv[i] * i % MOD;
  }
  auto comb = [&] (ll n, ll k) {
    return fact[n] * finv[k] % MOD * finv[n-k] % MOD;
  };
  ll n;
  cin>>n;
  string s;
  cin>>s;
  ll ans = 0;
  REP(k,n-1) {
    ll tmp = 0;
    FOR(span,k,n-1){
      ll c = comb(span, k);
      REP(i,n) {
        if (i+span+1 >= n) break;
        if (s[i] != 'i' || s[i+span+1] != 'n') {
          continue;
        }
        tmp += c;
        tmp %= MOD;
      }
    }
    ans ^= tmp;
  }
  cout<<ans<<"\n";
  return 0;
}