#include <bits/stdc++.h>
#define _rep(i, x, y) for(int i = x; i <= y; ++i)
#define _req(i, x, y) for(int i = x; i >= y; --i)
#define _rev(i, u) for(int i = head[u]; i; i = e[i].nxt)
#define pb push_back
#define fi first
#define se second
#define mst(f, i) memset(f, i, sizeof f)
using namespace std;
#ifdef ONLINE_JUDGE
#define debug(...) 0
#else
#define debug(...) fprintf(stderr, __VA_ARGS__), fflush(stderr)
#endif
typedef long long ll;
typedef pair<int, int> PII;
namespace fastio{
    #ifdef ONLINE_JUDGE
    char ibuf[1 << 20],*p1 = ibuf, *p2 = ibuf;
    #define get() p1 == p2 && (p2 = (p1 = ibuf) + fread(ibuf, 1, 1 << 20, stdin), p1 == p2) ? EOF : *p1++
    #else
    #define get() getchar()
    #endif
    template<typename T> inline void read(T &t){
        T x = 0, f = 1;
        char c = getchar();
        while(!isdigit(c)){
            if(c == '-') f = -f;
            c = getchar();
        }
        while(isdigit(c)) x = x * 10 + c - '0', c = getchar();
        t = x * f;
    }
    template<typename T, typename ... Args> inline void read(T &t, Args&... args){
        read(t);
        read(args...);
    }
    template<typename T> void write(T t){
        if(t < 0) putchar('-'), t = -t;
        if(t >= 10) write(t / 10);
        putchar(t % 10 + '0');
    }
    template<typename T, typename ... Args> void write(T t, Args... args){
        write(t), putchar(' '), write(args...);
    }
    template<typename T> void writeln(T t){
        write(t);
        puts("");
    }
    template<typename T> void writes(T t){
        write(t), putchar(' ');
    }
    #undef get
};
using namespace fastio;
#define multitest() int T; read(T); _rep(tCase, 1, T)
namespace Calculation{
    const ll mod = 998244353;
    ll ksm(ll p, ll h){ll base = p % mod, res = 1; while(h){if(h & 1ll) res = res * base % mod; base = base * base % mod, h >>= 1ll;} return res;}
    void dec(ll &x, ll y){x = ((x - y) % mod + mod) % mod;}
    void add(ll &x, ll y){x = (x + y) % mod;}
    void mul(ll &x, ll y){x = x * y % mod;}
    ll sub(ll x, ll y){return ((x - y) % mod + mod) % mod;}
    ll pls(ll x, ll y){return ((x + y) % mod + mod) % mod;}
    ll mult(ll x, ll y){return x * y % mod;}
}
using namespace Calculation;
const int N = 1e5 + 5;
int n, id, dfn[N], siz[N], dep[N], c[N];//1:long 2:short 3:same
int f[N];
vector<PII> ans;
vector<int> G[N];
void fail(){puts("NO"); exit(0);}
void dfs(int u){
    vector<PII> cur[4];
    for(auto &v : G[u]){
        dep[v] = dep[u] + 1, dfs(v);
        if(f[v]) cur[c[f[v]]].pb({dep[f[v]], f[v]});
    }
    if(c[u]) cur[c[u]].pb({dep[u], u});
    _rep(i, 1, 3) sort(cur[i].begin(), cur[i].end());
    vector<PII> now;
    while(cur[3].size()){
        if(cur[3].size() == 1) now.pb(cur[3].back()), cur[3].pop_back();
        else{
            int len = cur[3].size();
            if(cur[3][len - 1].fi == cur[3][len - 2].fi){
                ans.pb({cur[3][len - 1].se, cur[3][len - 2].se});
                cur[3].pop_back(), cur[3].pop_back();
            }else{
                now.pb(cur[3].back());
                cur[3].pop_back();
            }
        }
    }
    if(cur[1].size() > cur[2].size()){
        reverse(cur[1].begin(), cur[1].end());
        reverse(cur[2].begin(), cur[2].end());
        while(cur[1].size() && cur[2].size()){
            int u = cur[1].back().se, v = cur[2].back().se;
            if(dep[u] > dep[v]){
                ans.pb({u, v}), cur[1].pop_back(), cur[2].pop_back();
                continue;
            }
            now.pb(cur[1].back());
            cur[1].pop_back();
        }
    }else{
        while(cur[1].size() && cur[2].size()){
            int u = cur[1].back().se, v = cur[2].back().se;
            if(dep[u] > dep[v]){
                ans.pb({u, v}), cur[1].pop_back(), cur[2].pop_back();
                continue;
            }
            now.pb(cur[2].back());
            cur[2].pop_back();
        }
    }
    for(auto &i : cur[1]) now.pb(i); for(auto &i : cur[2]) now.pb(i);
    if(now.size() > 1) fail();
    if(now.size() == 1) f[u] = now[0].se;
}
int main(){
    read(n);
    _rep(i, 2, n){
        int u, v; read(u, v);
        char ch[10]; scanf("%s", ch);
        G[v].pb(u);
        if(ch[0] == '-') c[u] = 0;
        else if(ch[0] == 'C') c[u] = 1;
        else if(ch[0] == 'D') c[u] = 2;
        else c[u] = 3;
    }    
    dfs(1);
    puts("YES");
    for(auto &i : ans) write(i.fi, i.se), puts("");
    return 0;
}