// halozati biztonsag.cpp : This file contains the 'main' function. Program execution begins and ends there.
//

#include <iostream>
#include <vector>
#include <deque>
#include <climits>
#define ll long long

using namespace std;
struct adat
{
    bool lat;
    vector<ll>sz;
};

int n, i, m,a, b,k;
deque<ll>v,megold;
ll akt;
int main()
{
    cin >> n >> m >> k;
    vector<adat>x(n + 1);
    for (i = 1; i <= m; ++i)
    {
        cin >> a >> b;
        x[a].sz.push_back(b);
        x[b].sz.push_back(a);
    }
    for (i = 1; i <= n; ++i)
    {
        if (x[i].sz.size() <k)
        {
            v.push_back(i);
            x[i].lat = true;
            
        }
    }
    while (!v.empty())
    {
        akt = v.front();
        v.pop_front();
        for (auto& e : x[akt].sz)
        {
            if (!x[e].lat && x[e].sz.size()-1 < k)
            {
                x[e].lat = true;
                v.push_back(e);
            }
        }
    }
    for (i = 1; i <= n; ++i) if (x[i].lat == false) megold.push_back(i);
    cout << megold.size() << "\n";
    for (auto& e : megold) cout << e<<" ";
    return 0;
}
/*
8 12 3
8 7
7 3
4 3
8 5
6 5
3 1
2 1
7 1
2 7
2 3
4 6
4 7


*/
// Run program: Ctrl + F5 or Debug > Start Without Debugging menu
// Debug program: F5 or Debug > Start Debugging menu

// Tips for Getting Started: 
//   1. Use the Solution Explorer window to add/manage files
//   2. Use the Team Explorer window to connect to source control
//   3. Use the Output window to see build output and other messages
//   4. Use the Error List window to view errors
//   5. Go to Project > Add New Item to create new code files, or Project > Add Existing Item to add existing code files to the project
//   6. In the future, to open this project again, go to File > Open > Project and select the .sln file