#include <iostream>
#include <vector>
using namespace std;

struct Diak
{
    string Neptun;
    int Eredm;
};

bool joD(Diak t)
{
    bool jo = (t.Eredm >= 1) && (t.Eredm <= 5) && (t.Neptun.length() == 6);
    if (!jo)
    {
        cerr << "Hibas neptunkod vagy eredmeny!" << endl;
    }
    return jo;
}

Diak beolv2(int ind, Diak &t)
{
    cerr << "Kerem adja meg a(z) " << ind+1 << ". diak neptunkodjat es eredmenyet!\n";
    do
    {
        cin >> t.Neptun >> t.Eredm;
    } while (!joD(t));
    return t;
}

void beolv(int &N, int &M, vector<Diak> &zh, vector<Diak> &potzh)
{
    cerr << "Kerem adja meg a zh-val probalkozo diakok szamat! ";
    cin >> N;
    cerr << "Kerem adja meg a potzh-val probalkozo diakok szamat! ";
    cin >> M;
    Diak temp1;
    cerr << "ZH:\n";
    for (int i = 0; i < N; i++)
    {
        beolv2(i, temp1);
        zh.push_back (temp1);
    }
    Diak temp2;
    cerr << "PotZH:\n";
    for (int i = 0; i < M; i++)
    {
        beolv2(i, temp2);
        potzh.push_back (temp2);
    }
}

void feldolg(int N, int M, int &db, vector<Diak> zh, vector<Diak> potzh, vector<string> &neptunok)
{
    db = 0;
    for (int i = 0; i < N; i++)
    {
        for (int j = 0; j < M; j++)
        {
            if (zh[i].Neptun == potzh[j].Neptun)
            {
                db++;
                neptunok.push_back (zh[i].Neptun);
            }
        }
    }
}

void kiiras(int db, vector<string> neptunok)
{
    cerr << "Osszesen ";
    cout << db;
    cerr << " diak probalkozott zhval es potzhval is.\nNeptunkodjaik:" << endl;
    for (int i = 0; i < db; i++)
    {
        cout << neptunok[i] << endl;
    }
}

int main()
{
    int N;
    int M;
    int db;
    vector<Diak> zh;
    vector<Diak> potzh;
    vector<string> neptunok;
    beolv(N,M,zh,potzh);
    feldolg(N,M,db,zh,potzh,neptunok);
    kiiras(db,neptunok);
    return 0;
}