#include <bits/stdc++.h>
#define int long long
using namespace std;

map<pair<string, int>, int> id;
vector<vector<int>> g;
map<string, vector<int>> vers;
signed main() {
    //freopen(".in", "r", stdin);
    //freopen(".out", "w", stdout);
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int n;
    cin >> n;
    for(int i = 0; i < n; i++){
        string s;
        int a;
        cin >> s >> a;
        if(!id.count({s,a})){
            id[{s,a}] = g.size();
            g.push_back(vector<int>());
            vers[s].push_back(a);
        }
        int v = id[{s,a}];
        int m;
        cin >> m;
        for(int i = 0; i < m; i++){
            cin >> s >> a;
            if(!id.count({s,a})){
                id[{s,a}] = g.size();
                g.push_back(vector<int>());
                vers[s].push_back(a);
            }
            g[v].push_back(id[{s,a}]);
        }
    }
    queue<int> q;
    vector<int> dist(n, 1e9);
    vector<int> used(n);
    dist[0] = 0;
    q.push(0);
    while(q.size()){
        int v = q.front();
        q.pop();
        if(used[v]) continue;
        used[v] = 1;
        for(int i = 0; i < g[v].size(); i++){
            if(dist[g[v][i]] > dist[v] + 1){
                dist[g[v][i]] = dist[v] + 1;
                q.push(g[v][i]);
            }
        }
    }
    vector<pair<string, int>> ans;
    for(auto it : vers){
        int idx = 0;
        int _min = 1e9;
        for(int i = 0; i < it.second.size(); i++){
            int a = it.second[i];
            int v = id[{it.first, a}];
            if(dist[v] < _min || dist[v] == _min && a > idx){
                idx = a;
                _min = dist[v];
            }
        }
        if(_min != 1e9 && _min != 0) ans.push_back({it.first, idx});
    }
    sort(ans.begin(), ans.end());
    cout << ans.size() << '\n';
    for(auto it : ans){
        cout << it.first << ' ' << it.second << '\n';
    }
    return 0;
}