//#pragma GCC optimize(3,"Ofast","inline")
//#pragma GCC optimize("-Ofast","-funroll-all-loops")
#include<bits/stdc++.h>
//#define getchar nc
#define sight(c) ('0'<=c&&c<='9')
#define swap(a,b) a^=b,b^=a,a^=b
#define LL long long
#define debug(a) cout<<#a<<" is "<<a<<"\n"
#define dput(a) puts("a")
#define eho(x) for(int i=head[x];i;i=net[i])
#define fi first
#define se second
inline char nc(){
static char buf[1000000],*p1=buf,*p2=buf;
return p1==p2&&(p2=(p1=buf)+fread(buf,1,1000000,stdin),p1==p2)?EOF:*p1++;
}
template <class T>
inline void read(T &x){// unsigned
    static char c;
    for (c=getchar();!sight(c);c=getchar());
    for (x=0;sight(c);c=getchar())x=x*10+c-48;
}
template <class T> void write(T x){if (x<10) {putchar('0'+x); return;} write(x/10); putchar('0'+x%10);}
template <class T> inline void writeln(T x){ if (x<0) putchar('-'),x*=-1; write(x); putchar('\n'); }
template <class T> inline void writel(T x){ if (x<0) putchar('-'),x*=-1; write(x); putchar(' '); }
using namespace std;
#define pii pair<int,int> 
#define pb push_back
#define N 200007
int n,f[N],dep[N];
char ch[17];
vector<pii> ans,V,Vd,Vc;
signed main() {
	#ifdef LOCAL
	//	freopen("test.in", "r", stdin);
	//	freopen("test.out", "w", stdout);
	#endif
	scanf("%d",&n);
	for (int i=2;i<=n;i++) {
		scanf("%d%d%s",&i,&f[i],ch);
		dep[i]=dep[f[i]]+1;
		if (ch[0]=='T') V.pb(pii(dep[i],i));
		if (ch[0]=='D') Vd.pb(pii(dep[i],i));
		if (ch[0]=='C') Vc.pb(pii(dep[i],i));
	}
	sort(V.begin(),V.end());
	sort(Vd.begin(),Vd.end());
	sort(Vc.begin(),Vc.end());
	int last=-1;
	for (auto Z:V) {
		if (last==-1) last=Z.se;
		else {
		 	if (dep[last]!=Z.fi){
				printf("NO");
				exit(0);
			} else {
			 	ans.pb(pii(last,Z.se));
			 	last=-1;  
			 }
		}
	}
	if (last!=-1) {
		printf("NO");
		exit(0);
	}
	if (Vd.size()!=Vc.size()) {
		printf("NO");
		exit(0);
	} 
	for (int i=0;i<Vd.size();i++) 
	 if (Vd[i].fi>=Vc[i].fi)  {
	 	printf("NO");
		exit(0);
	 } else {
	 	ans.pb(pii(Vd[i].se,Vc[i].se));
	 }
	printf("YES\n");
	for (auto Z:ans){
		printf("%d %d\n",Z.fi,Z.se);
	}
    return 0;
}