#include<bits/stdc++.h>
namespace {
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-function"
#include<atcoder/all>
#pragma GCC diagnostic pop
using namespace std;
using namespace atcoder;
#define rep(i,n) for(int i = 0; i < (int)(n); i++)
#define rrep(i,n) for(int i = (int)(n) - 1; i >= 0; i--)
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
template<class T> bool chmax(T& a, const T& b) { if (a < b) { a = b; return true; } else return false; }
template<class T> bool chmin(T& a, const T& b) { if (b < a) { a = b; return true; } else return false; }
using ll = long long;
using P = pair<int,int>;
using VI = vector<int>;
using VVI = vector<VI>;
using VL = vector<ll>;
using VVL = vector<VL>;
using mint = modint998244353;

int m;
struct S {
  bool first_ok[50]{}, second_ok[50]{};
  mint cnt;
  int len = 0;
  friend S operator*(S x, S y) {
    S z;
    z.cnt = x.cnt + y.cnt;
    z.len = x.len + y.len;
    for(int i = 1; i < m; i++) if (x.first_ok[i] && y.second_ok[i]) {
      if (i <= x.len) {
        if (i + y.len >= m) {
          z.cnt++;
        } else {
          z.first_ok[i + y.len] = true;
        }
      } else {
        z.second_ok[i - x.len] = true;
        if (i + y.len < m) z.first_ok[i + y.len] = true;
      }
    }
    for(int i = 1; i < m; i++) if (m - i < x.len) z.second_ok[i] = x.second_ok[i];
    for(int i = 1; i < m; i++) if (i < y.len) z.first_ok[i] = y.first_ok[i];
    return z;
  }
};

} int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n;
  cin >> n;
  string t;
  cin >> t;
  m = t.size();
  vector<S> d(n);
  rep(z, n) {
    string s;
    cin >> s;
    if (s[0] == '~') {
      int j, k;
      cin >> j >> k;
      j--, k--;
      d[z] = d[j] * d[k];
    } else {
      S A;
      int sz = s.size();
      A.len = sz;
      auto chk = [&](int p1, int p2) {
        while(p1 < m && p2 < sz) if (t[p1++] != s[p2++]) return false;
        return true;
      };
      for(int i = 1; i < m; i++) if (chk(i, 0)) {
        A.second_ok[i] = true;
        if (i + sz < m) A.first_ok[i + sz] = true;
      }
      for(int p = 0; p < sz; p++) if (chk(0, p)) {
        if (sz - p >= m) A.cnt++;
        else A.first_ok[sz - p] = true;
      }
      d[z] = A;
    }
  }
  mint ans = d[n - 1].cnt;
  cout << ans.val() << '\n';
}