#include<bits/stdc++.h>
namespace {
#pragma GCC diagnostic ignored "-Wunused-function"
#include<atcoder/all>
#pragma GCC diagnostic warning "-Wunused-function"
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 main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n;
  cin >> n;
  VI a[4];
  rep(_, n) {
    char c;
    int x;
    cin >> c >> x;
    int i = c == 'U' ? 0 : c == 'F' ? 1 : c == 'W' ? 2 : 3;
    a[i].emplace_back(x);
  }
  mint ans = 1;
  ll tot = 0;
  rep(i, 3) {
    int c = a[i+1].size();
    if (c == 0) {
      ans = 0;
      break;
    }
    mint v;
    for(int x: a[i]) {
      v += 1 - (mint(n - 1 - 1) / (n - 1)).pow(x);
      tot += x;
    }
    ans *= v;
  }
  tot += accumulate(all(a[3]), 0LL);
  ans *= a[3].size();
  ans *= mint(n - 1).pow(tot);
  cout << ans.val() << '\n';
}