#include <bits/stdc++.h>
#define int long long
#define endl "\n"

using namespace std;

const int N = 2e5 + 10;

typedef long long LL;
pair<LL,LL> duan[N],chang[N],tong[N];
char ch[N];
vector<LL> vec[N];
LL n;
LL inde_duan,inde_chang,inde_tong;
void dfs(LL pos,LL dp){
	if(ch[pos]=='T'){
		tong[++inde_tong]={pos,dp};
	}else if(ch[pos]=='C'){
		chang[++inde_chang]={pos,dp};
	}else if(ch[pos]=='D'){
		duan[++inde_duan]={pos,dp};
	}
	for(LL i=vec[pos].size()-1;~i;--i){
		dfs(vec[pos][i],dp+1);
	}
}
bool check(){
	if(inde_chang!=inde_duan||(inde_tong&1)) return false;
	for(LL i=1;i<=inde_tong;i+=2){
		if(tong[i].second!=tong[i+1].second){
			return false;
		}
	}
	for(LL i=1;i<=inde_duan;++i){
		if(duan[i].second>=chang[i].second){
			return false;
		}
	}
	return true;
}
void solve() {
	cin >> n;
	if(n==1){
		cout<<"YES"<<endl;
		return;
	}
	for(int i = 1; i < n; i++) {
		LL data,data2;
		string str;
		cin>>data>>data2>>str;
		vec[data2].push_back(data);
		ch[data]=str[0];
	}
	dfs(1,0);
	sort(tong+1,tong+inde_tong,[&](const auto& a,const auto &b){
		return a.second<b.second;
	});
	sort(duan+1,duan+inde_duan,[&](const auto& a,const auto &b){
		return a.second<b.second;
	});
	sort(chang+1,chang+inde_chang,[&](const auto& a,const auto &b){
		return a.second<b.second;
	});
	if(check()){
		cout<<"YES"<<endl;
		for(LL i=1;i<=inde_tong;i+=2){
			cout<<tong[i].first<<' '<<tong[i+1].first<<endl;
		}
		for(LL i=1;i<=inde_duan;++i){
			cout<<duan[i].first<<' '<<chang[i].first<<endl;
		}
	}else{
		cout<<"NO"<<endl;
	}
}

signed main()
{
	ios::sync_with_stdio(false), cin.tie(0);
	cout.tie(0);
	
	int t = 1;
	// cin >> t;
	while(t--) {
		solve();
	}
}