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

long long mod = 998244353;
long long dp[110];

int main(){
    int N; cin >> N;
    if(N%10){cout << "0\n"; return 0;}
    if(N <= 100){
        string s; cin >> s;
        s += "ooooooo";
        for(int i=0; i<=100; i++) dp[i] = 0;
        dp[0] = 1;
        for(int i=0; i<N; i+=10){
            if(dp[i] == 0) continue;
            for(int k=1; ; k++){
                if(i+k*10 > N) break;
                int pos = i,loop = k;
                if(s.at(i+2*k) == 'o' && s.at(i+5*k) == 'o' && s.at(i+10*k) == 'o') dp[i+10*k] += dp[i];
            }
        }
        cout << dp[N]%mod << "\n";
    }
}