#include <iostream>
#include <algorithm>
#include <iomanip>
#include <vector>
#include <queue>
#include <deque>
#include <set>
#include <map>
#include <tuple>
#include <cmath>
#include <numeric>
#include <functional>
#include <cassert>
#include <atcoder/modint>

#define debug(x) cerr << "line" << __LINE__ << ":<" << __func__ << ">:" << x << endl;

template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }

using namespace std;
typedef long long ll;

template<typename T>
vector<vector<T>> vec2d(int n, int m, T v){
    return vector<vector<T>>(n, vector<T>(m, v));
}

template<typename T>
vector<vector<vector<T>>> vec3d(int n, int m, int k, T v){
    return vector<vector<vector<T>>>(n, vector<vector<T>>(m, vector<T>(k, v)));
}

template<typename T>
void print_vector(vector<T> v, char delimiter=' '){
    if(v.empty()) {
        cout << endl;
        return;
    }
    for(int i = 0; i+1 < v.size(); i++) cout << v[i] << delimiter;
    cout << v.back() << endl;
}

using mint = atcoder::modint998244353;

ostream& operator<<(ostream& os, const mint& m){
    os << m.val();
    return os;
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout << setprecision(10) << fixed;
    int n; cin >> n;
    vector<vector<int>> v(4);
    ll a_all = 0;
    for(int i = 0; i < n; i++){
        string s;
        int a;
        cin >> s >> a;
        a_all += a;
        if(s == "U"){
            v[0].push_back(a);
        }else if(s == "F"){
            v[1].push_back(a);
        }else if(s == "W"){
            v[2].push_back(a);
        }else{
            v[3].push_back(a);
        }
    }
    if(n <= 3){
        cout << 0 << endl;
        return 0;
    }
    mint ans = mint(n-1).pow(a_all);
    for(int i = 0; i < 3; i++){
        mint sum = 0;
        for(int a: v[i]){
            mint p = mint(n-2)/mint(n-1);
            sum += (1-p.pow(a));
        }
        ans *= sum;
    }
    ans *= v[3].size();
    cout << ans << endl;
}