#include <bits/stdc++.h>
using namespace std;
const long long MOD = 998244353;
int main(){
  int N;
  cin >> N;
  string S;
  for (int i = 0; i < N; i++){
    string S2;
    cin >> S2;
    S += S2;
  }
  vector<int> A(N * 16);
  for (int i = 0; i < N * 16; i++){
    if (S[i] == '.'){
      A[i] = 0;
    }
    if (S[i] == 'd'){
      A[i] = 1;
    }
    if (S[i] == 'k'){
      A[i] = 2;
    }
  }
  vector<vector<long long>> dp(N * 16 + 1, vector<long long>(3, 0));
  dp[1][A[0]]++;
  if (A[0] == 0){
    dp[1][1]++;
    dp[1][2]++;
  }
  for (int i = 1; i < N * 16; i++){
    for (int j = 0; j < 3; j++){
      for (int k = 0; k < 3; k++){
        bool ok = true;
        if (i % 2 == 1 && j == 0 && k != 0){
          ok = false;
        }
        if (i % 2 == 0 && k == 0 && j != 0){
          ok = false;
        }
        if (A[i] != 0 && k != A[i]){
          ok = false;
        }
        if (A[i - 1] == 0 && A[i] != 0 && j == A[i]){
          ok = false;
        }
        if (ok){
          dp[i + 1][k] += dp[i][j];
          dp[i + 1][k] %= MOD;
        }
      }
    }
  }
  long long ans = 0;
  for (int i = 0; i < 3; i++){
    ans += dp[N * 16][i];
  }
  cout << ans % MOD << endl;
}