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#include <iostream>
#include <vector>

using namespace std;

int n, m, d, b;
bool c[200000];
vector<int> w, v[200000];

int main()
{
    ios_base::sync_with_stdio(0);
    cin >> n >> m >> d;
    for (int i = 0, x, y; i < m; ++i)
    {
        cin >> x >> y;
        v[x - 1].push_back(y - 1);
        v[y - 1].push_back(x - 1);
    }
    bool stop = false;
    while (!stop)
    {
        stop = true;
        for (int i = 0; i < n; ++i)
        {
            int num = v[i].size();
            if (num != 0 && num < d)
            {
                stop = false;
                for (int j = 0; j < num; ++j)
                {
                    int ver = v[i][j];
                    int f = 0, l = v[ver].size();
                    int mid = (f + l) / 2;
                    while (v[ver][mid] != i)
                    {
                        if (v[ver][mid] < i) f = mid + 1;
                        else l = mid - 1;
                        mid = (f + l) / 2;
                    }
                    v[ver].erase(v[ver].begin() + mid);
                }
                v[i].clear();
            }
        }
    }
    for (int i = 0; i < n; i++)
    {
        if (c[i] == false)
        {
            c[i] = true;
            vector<int> s;
            s.push_back(i);
            for (int it = 0; it < s.size(); ++it)
            {
                int top = s[it];
                int num = v[top].size();
                for (int j = 0; j < num; ++j)
                {
                    if (!c[v[top][j]])
                    {
                        c[v[top][j]] = true;
                        s.push_back(v[top][j]);
                    }
                }
            }
            if (s.size() > b)
            {
                b = s.size();
                w.swap(s);
            }
        }
    }
    if (b <= 1) cout << "NIE" << endl;
    else
    {
        cout << b << endl;
        for (int i : w) cout << i + 1 << ' ';
    }
    return 0;
}