//#pragma GCC target("avx")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#include<bits/stdc++.h>
using namespace std;

int e1[270001];
int e2[270001];
int dp[14001]; 

int main() {
	ios::sync_with_stdio(false);
	std::cin.tie(nullptr);

	int n; cin >> n;
	constexpr int mask = 2147483647;
	for (int i=0; i<=n; ++i) {
		char x; cin >> x;
		if (x == 'o') {
			e1[((i%5)<<15)|(i/5)] = mask;
			e2[((i%8)<<15)|(i/8)]= mask;
		}
	}

	if (n % 10 != 0) {
		cout << 0 << '\n';
		return 0;
	}	

	dp[0] = 1;
	for (int i=1; i<=n/10; ++i){
		int w = i*10;
		if (!e1[((w%5)<<15)|(w/5)]) continue;
		long long t = 0;
		int a = ((w%5)<<15)|((w-5*i)/5);
		int b = ((w%8)<<15)|((w-8*i)/8);
		for (int k=0; k<i; ++k) {
			t += dp[k] & e1[a+k] & e2[b+k];
		}
		dp[i] = static_cast<int>(t % 998244353);
	}
	cout << dp[n/10] << '\n';
}