// kでループ、部分列のとり方を全探索
#include <bits/stdc++.h>
#include <x86intrin.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;

int main() {
  ll n;
  cin>>n;
  string s;
  cin>>s;
  ll ans = 0;
  REP(k,n-1) {
    ll tmp = 0;
    ll len = k + 2;
    ll x, y;
    for (ll T = (1l << len) - 1; T < (1l << n); x = T & -T, y = T + x, T = (((T & ~y) / x) >> 1) | y) {
      int mn = __builtin_ctzll(T);
      int mx = 63 - __builtin_clzll(T);
      if (s[mn] == 'i' && s[mx] == 'n') {
        ++tmp;
        tmp %= MOD;
      }
    }
    ans ^= tmp;
  }
  cout<<ans<<"\n";
  return 0;
}