#include <stdio.h>
#include <atcoder/all>
#include <bits/stdc++.h>
using namespace std;
using namespace atcoder;
using mint = modint998244353;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf32 1000000001
#define Inf64 4000000000000000001


int main(){
	
	int N;
	cin>>N;
	
	vector<int> x(N),y(N);
	rep(i,N){
		char c;
		cin>>c;
		if(c=='U')x[i] = 0;
		if(c=='F')x[i] = 1;
		if(c=='W')x[i] = 2;
		if(c=='P')x[i] = 3;
		cin>>y[i];
	}
	
	vector<mint> dp(1<<4,0);
	dp[0] = 1;
	rep(i,N){
		vector<mint> ndp(1<<4);
		mint A = mint(N-1).pow(y[i]);
		mint B = mint(N-1).pow(y[i]) - mint(N-2).pow(y[i]);
		rep(j,1<<4){
			ndp[j] += dp[j] * A;
			if((j>>x[i])&1)continue;
			if(x[i]!=3)ndp[j|(1<<x[i])] += dp[j] * B;
			else ndp[j|(1<<x[i])] += dp[j] * A;
		}
		swap(dp,ndp);
	}
	cout<<dp.back().val()<<endl;
	
	return 0;
}