#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#ifdef NACHIA
#define _GLIBCXX_DEBUG
#else
#define NDEBUG
#endif
#include <cstdio>
#include <string>
#include <vector>
#include <algorithm>
using i64 = long long;
using u64 = unsigned long long;
#define rep(i,n) for(i64 i=0; i<i64(n); i++)
const i64 INF = 1001001001001001001;
template<typename A> void chmin(A& l, const A& r){ if(r < l) l = r; }
template<typename A> void chmax(A& l, const A& r){ if(l < r) l = r; }
using namespace std;

char S[150000];
i64 dp[15000] = {};
i64 P[70001] = {};
i64 Q[30000] = {};

void testcase(){
    i64 N; scanf("%lld ", &N);
    fread(S, 1, N+1, stdin);
    if(N%10 != 0){ printf("0\n"); }
    dp[0] = 1;
    for(i64 i=0; i<=N/2; i++) P[i] = (S[i*2] == 'o' ? 0xffffffff : 0);
    for(i64 i=0; i<=N/5; i++) Q[i] = (S[i*5] == 'o' ? 0xffffffff : 0);
    rep(s,N/10+1) if(S[s*10] == 'o'){
        dp[s] %= 998244353;
        i64 f = s * 10;
        i64 p = s * 5;
        i64 q = s * 2;
        i64 len = (N - f) / 10;
        for(i64 t=1; t<=len; t++){
            dp[s+t] += dp[s] & P[p+t] & Q[q+t];
        }
    }
    printf("%d\n", int(dp[N/10]));
}

int main(){
    testcase();
    return 0;
}