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#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <vector>
#include <stack>
#include <queue>
#include <algorithm>
#include <cmath>
#include <list>
#include <map>
#include <set>
#include <unordered_set>
using namespace std;

typedef long long int LL;
typedef long double LD;
typedef vector<int> VI;
typedef vector<LL> VLL;
typedef vector<LD> VLD;
typedef vector<string> VS;
typedef pair<int, int> PII;
typedef vector<PII> VPII;

const int INF = 1000000001;
const LD EPS = 10e-9;

#define FOR(x, b, e) for(int x = b; x <= (e); ++x)
#define FORD(x, b, e) for(int x = b; x >= (e); --x)
#define REP(x, n) for(int x = 0; x < (n); ++x)
#define VAR(v, n) __typeof(n) v = (n)
#define ALL(c) (c).begin(), (c).end()
#define SIZE(x) ((int)(x).size())
#define FORE(i, c) for(VAR(i, (c).begin()); i != (c).end(); ++i)
#define MP make_pair
#define PB push_back
#define ST first
#define ND second
#define abs(a) ((a)<0 ? -(a) : (a))
#define max(a, b) ((a) > (b) ? (a) : (b))
#define min(a, b) ((a) < (b) ? (a) : (b))

const int MAX_N = 200005;

int n, m, d, a, b;
unordered_set<int> g[MAX_N];
set<pair<int, int>> minDegrees;
int degrees[MAX_N];
bool vis[MAX_N];
pair<int, vector<int>> result;

pair<int, vector<int>> bfs(int s)
{
	pair<int, vector<int>> res;
	vis[s] = true;
	queue<int> q;
	q.push(s);
	
	while(!q.empty())
	{
		int v = q.front();
		q.pop();
		
		res.first++;
		res.second.push_back(v);
		
		for(auto w : g[v])
		{
			if(!vis[w])
			{
				vis[w] = true;
				q.push(w);
			}
		}
	}
	
	return res;
}

int main()
{
	scanf("%d %d %d", &n, &m, &d);
	REP(i, m)
	{
		scanf("%d %d", &a, &b);
		g[a].insert(b);
		g[b].insert(a);
	}
	
	FOR(i, 1, n)
	{
		minDegrees.insert(make_pair(g[i].size(), i));
	}
	
	while(!minDegrees.empty())
	{
		pair<int, int> minDegree = *minDegrees.begin();
		minDegrees.erase(minDegrees.begin());
		
		//cout << "minD: " << minDegree.first << ", v: " << minDegree.second << endl;
		
		if(minDegree.first >= d)
		{
			break;
		}
		
		for(auto v : g[minDegree.second])
		{
			//cout << "v: " << v << endl;
			
			minDegrees.erase(make_pair(g[v].size(), v));
			g[v].erase(minDegree.second);	
			minDegrees.insert(make_pair(g[v].size(), v));
		}
		g[minDegree.second].clear();
		
		//cout << "usuwanie" << endl;
	}
	
	//cout << "usunieto wierzcholki" << endl;
	
	FOR(i, 1, n)
	{
		if(!vis[i])
		{
			pair<int, vector<int>> actRes = bfs(i);
			if(actRes.first > result.first)
			{
				result = actRes;
			}	
		}
	}
	
	if(result.first <= 1)
	{
		printf("NIE\n");
		return 0;
	}
	
	sort(result.second.begin(), result.second.end());
	printf("%d\n", result.first);
	for(auto v : result.second)
	{
		printf("%d ", v);
	}
	printf("\n");
	
	return 0;
}