#include<bits/stdc++.h>
#define ll long long
#define ull unsigned long long
#define lowbit(i) (i&-i)
#define rand() (myrand())
using namespace std;
mt19937 myrand(time(0));
const int maxn = 2e5 + 5;
int n, _, head[maxn], cnt;
int c[maxn], dep[maxn], jud, fa[maxn];
string ty;
vector<pair<int, int> >ans;
struct node{
	int next, to;
}edge[maxn<<1];
void addedge(int from, int to) {
	edge[++cnt].next = head[from];
	edge[cnt].to = to;
	head[from] = cnt;
}
bool cmp(int x, int y) {return dep[x] < dep[y];}
int dfs(int u, int p) {
	if (jud) return 0;
	dep[u] = dep[p] + 1;
	vector<int>a[3];
	if (c[u] != -1) a[c[u]].push_back(u);
	for (int i = head[u] ; i ; i = edge[i].next) {
		int v = edge[i].to;
		if (v == p) continue;
		int x = dfs(v, u);
		if (c[x] != -1) a[c[x]].push_back(x);
	}
	sort(a[0].begin(), a[0].end(), cmp);
	sort(a[1].begin(), a[1].end(), cmp);
	sort(a[2].begin(), a[2].end(), cmp);
	int len0 = a[0].size(), len1 = a[1].size(), len2 = a[2].size(), res = 0, cnt = 0, pos = 0;
	while(pos < len0) {
		vector<int>stk;
		stk.push_back(a[0][pos]);
		while(pos + 1 < len0 && dep[a[0][pos + 1]] == dep[a[0][pos]]) {
			pos++;
			stk.push_back(a[0][pos]);
		}
		int tot = stk.size();
		if (tot >= 2) for (int i = 0 ; i < tot ; i += 2) {
			if (!stk[i] || !stk[i + 1]) continue;
			ans.push_back({stk[i], stk[i + 1]});
		}
		if (tot&1) {
			cnt++;
			res = stk[tot - 1];
		}
		pos++;
	}
	int i, j;
	if (len1 < len2) {
		for (i = len2 - 1, j = len1 - 1 ; i >= 0 && j >= 0 ; --i) {
			if (dep[a[1][j]] > dep[a[2][i]]) {
				ans.push_back({a[1][j], a[2][i]});
				j--;
			}
			else {
				res = a[2][i];
				cnt++;
			}
		}	
		if (!i) res = a[2][i], cnt++;
		if (!j) res = a[1][j], cnt++;
	}
	else {
		for (i = 0, j = 0 ; i < len1 && j < len2 ; ++i) {
			if (dep[a[1][i]] > dep[a[2][j]]) {
				ans.push_back({a[1][i], a[2][j]});
				j++;
			}
			else {
				res = a[1][i];
				cnt++;
			}
		}
		if (i == len1 - 1) res = a[1][i], cnt++;
		if (j == len2 - 1) res = a[2][j], cnt++;
	}
	if (cnt > 1) {
		jud = 1;
		return 0;
	}
	return res;
}
void solve() {
	cin >> n;
	for (int i = 0 ; i <= n ; ++i) c[i] = -1;
	for (int i = 1 ; i < n ; ++i) {
		int x, p;
		cin >> x >> p >> ty;
		fa[x] = p;
		if (ty[0] != '-') {
			if (ty[0] == 'T') c[x] = 0;
			if (ty[0] == 'C') c[x] = 1;
			if (ty[0] == 'D') c[x] = 2; 
		}
		addedge(x, p);
		addedge(p, x);
	}
	if (dfs(1, 0)) jud = 1;
	if (jud) {
		cout << "NO" << '\n';
		return;
	}
	cout << "YES" << '\n';
	for (auto [x, y] : ans) {
		cout << x << ' ' << y << '\n';
	}
}
signed main(void) {
	ios::sync_with_stdio(false);
	cin.tie(0);
	solve();
	return 0;
}