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import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.*;

public class mis {
    BufferedReader rd;
    List<Set<Integer>> e;

    mis() throws IOException {
        rd = new BufferedReader(new InputStreamReader(System.in));
        compute();
    }

    private void compute() throws IOException {
        int[] a = intarr();
        int n = a[0];
        int m = a[1];
        int d = a[2];
        e = new ArrayList<>(n);
        for(int i=0;i<n;i++) {
            e.add(new HashSet<Integer>(0));
        }
        for(int i=0;i<m;i++) {
            a = intarr();
            a[0]--;
            a[1]--;
            addEdge(a[0],a[1]);
        }
        boolean changed = true;
        while(changed) {
            changed = false;
            for(int i=0;i<n;i++) {
                int s = e.get(i).size();
                if(s > 0 && s < d) {
                    changed = true;
                    Queue<Integer> toCheck = new ArrayDeque<>();
                    toCheck.add(i);
                    while(!toCheck.isEmpty()) {
                        int p = toCheck.poll();
                        Set<Integer> ne = e.get(p);
                        if(ne.size() < d) {
                            for(Integer x: ne) {
                                e.get(x).remove(p);
                            }
                            toCheck.addAll(ne);
                            e.set(p, new HashSet<Integer>(0));
                        }
                    }
                }
            }
        }

        int[] chosen = new int[n];
        int best = -1;
        int bestCnt = 0;
        int pass = 1;
        for(int i=0;i<n;i++) {
            if(chosen[i] == 0) {
                chosen[i] = 1;
                if(e.get(i).size() >= d) {
                    pass++;
                    chosen[i] = pass;
                    int cnt = 1;
                    Queue<Integer> toCheck = new ArrayDeque<>();
                    toCheck.add(i);
                    while(!toCheck.isEmpty()) {
                        int p = toCheck.poll();
                        for(Integer x: e.get(p)) {
                            if(chosen[x] == 0) {
                                chosen[x] = 1;
                                if(e.get(x).size() >= d) {
                                    chosen[x] = pass;
                                    cnt++;
                                    toCheck.add(x);
                                }
                            }
                        }
                    }
                    if(cnt > bestCnt && cnt > d) {
                        bestCnt = cnt;
                        best = pass;
                    }
                }
            }
        }
        if(best == -1) {
            out("NIE");
        } else {
            StringBuilder buf = new StringBuilder();
            buf.append(bestCnt).append('\n');
            boolean first = true;
            for(int i=0;i<n;i++) {
                if(chosen[i] == best) {
                    if(first) {
                        first = false;
                    } else {
                        buf.append(' ');
                    }
                    buf.append(i+1);
                }
            }
            out(buf);
        }
    }

    private void addEdge(int a, int b) {
        e.get(a).add(b);
        e.get(b).add(a);
    }

    private int[] intarr() throws IOException {
        return intarr(rd.readLine());
    }

    private int[] intarr(String s) {
        String[] q = split(s);
        int n = q.length;
        int[] a = new int[n];
        for(int i=0;i<n;i++) {
            a[i] = Integer.parseInt(q[i]);
        }
        return a;
    }

    public String[] split(String s) {
        if(s == null) {
            return new String[0];
        }
        int n = s.length();
        int start = -1;
        int end = 0;
        int sp = 0;
        boolean lastWhitespace = true;
        for(int i=0;i<n;i++) {
            char c = s.charAt(i);
            if(isWhitespace(c)) {
                lastWhitespace = true;
            } else {
                if(lastWhitespace) {
                    sp++;
                }
                if(start == -1) {
                    start = i;
                }
                end = i;
                lastWhitespace = false;
            }
        }
        if(start == -1) {
            return new String[0];
        }
        String[] res = new String[sp];
        int last = start;
        int x = 0;
        lastWhitespace = true;
        for(int i=start;i<=end;i++) {
            char c = s.charAt(i);
            boolean w = isWhitespace(c);
            if(w && !lastWhitespace) {
                res[x++] = s.substring(last,i);
            } else if(!w && lastWhitespace) {
                last = i;
            }
            lastWhitespace = w;
        }
        res[x] = s.substring(last,end+1);
        return res;
    }

    private boolean isWhitespace(char c) {
        return c==' ' || c=='\t';
    }

    private static void out(Object x) {
        System.out.println(x);
    }

    public static void main(String[] args) throws IOException {
        new mis();
    }
}