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#include <iostream>
#include <vector>
#include <set>
#include <list>

using namespace std;
typedef long long LL;

 LL n, m, d;
 
 struct Node
 {
    set<Node*> neigbours;
    LL number;
    LL order;
    Node(){order = 0;}
    void addNeighbour(Node * n)
    {
	neigbours.insert(n);
	order++;
    };
    void removeNeighbour(Node * n)
    {
	neigbours.erase(n);
	order--;
    }
 };
 
 void remove(Node * n)
 {
      list<Node *> toRemove;
      n->order=0;
      toRemove.push_back(n);
      while (toRemove.size())
      {
	  Node * r = toRemove.back();
	  toRemove.pop_back();
	  
	  for(set<Node *>::iterator i=r->neigbours.begin(); i!=r->neigbours.end(); i++)
	  {
	    (*i)->removeNeighbour(r);
	    if (((*i)->order > 0) && ((*i)->order < d)) 
	    {
		toRemove.push_back(*i);
		(*i)->order=0;
	    }
	  }
      }
 }
 
 LL componentSize(Node * n)
 {
      LL size=1;
      list<Node *> toVisit;
      toVisit.push_back(n);
      while (toVisit.size())
      {
	  Node * r = toVisit.back();
	  toVisit.pop_back();
	  for(set<Node *>::iterator i=r->neigbours.begin(); i!=r->neigbours.end(); i++)
	  {
	    r->order=0;
	    if ((*i)->order)
	    {
		toVisit.push_back(*i);
		(*i)->order=0;
		size++;
	    }
	  }  
      }
      return size;
 }
 
 int main()
 {
    LL max=0, nodeStart;
    
    std::cin >> n >> m >> d;
    
    if (d*d > 2*m)
    {
	cout << "NIE" << endl;
	return 0;
    }
    
    vector<Node> v(n);
    for (LL i=0; i<n; i++)
      v[i].number=i+1;
    
    LL a, b;
    for (LL i=0; i<m; i++)
    {
	std::cin >> a >> b;
	v[a-1].addNeighbour(&v[b-1]);
	v[b-1].addNeighbour(&v[a-1]);
    }
    
    for (LL i=0; i<n; i++)
    {
	if ((v[i].order > 0) && (v[i].order < d)) remove(&v[i]);
    }
    
    for (LL i=0; i<n; i++)
    {
	if ( v[i].order > 0 )
	{
	    LL bc = componentSize(&v[i]);
	    if (bc > max)
	    {
		max=bc;
		nodeStart = i;
	    }
	}
    }
    
    if (max < d) 
    {
	cout << "NIE" << endl;
	return 0;
    }
    
    cout << max << endl;
    
    list<LL> result;
    list<Node *> toVisit;
    toVisit.push_back(&v[nodeStart]);
    
    while (toVisit.size())
    {
	Node * r = toVisit.back();
	toVisit.pop_back();
	result.push_back(r->number);
	for(set<Node *>::iterator i=r->neigbours.begin(); i!=r->neigbours.end(); i++)
	{
	    r->order=1;
	    if ((*i)->order!=1)
	    {
		toVisit.push_back(*i);
		(*i)->order=1;
	    }
	}
    }
    
    result.sort();
    for(list<LL>::iterator i=result.begin(); i!=result.end(); i++)
	cout << *i << " ";
    cout << endl;  
    return 0;
 }