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#include<iostream>
#include<cstdio>
#include<cstdlib>
#include<cmath>
#include<algorithm>
#include<vector>
#include<set>
#include<map>
#include<stack>
#include<queue>
#include<list>
#include<string>
#include<cstring>

using namespace std;

#define PB push_back
#define MP make_pair
#define F first
#define S second
#define ALL(x) (x).begin(),(x).end()
#define SIZE(x) (int)(x).size()
#define SORT(x) sort((x).begin(),(x).end())
#define CLEAR(tab) memset(tab, 0, sizeof(tab))
#define REP(x, n) for(int x = 0; x < (n); x++)
#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 VAR(v, n) __typeof(n) v = (n)
#define FOREACH(i, c) for(VAR(i, (c).begin()); i != (c).end(); ++i)
#define DEBUG(fmt, ...) fprintf(stderr, fmt, ##__VA_ARGS__)

const int MAX_BUF_SIZE = 16384;
char BUFOR[MAX_BUF_SIZE];
int BUF_SIZE, BUF_POS;
char ZZZ;
#define GET(ZZZ){ZZZ='a';if(BUF_POS<BUF_SIZE)ZZZ=BUFOR[BUF_POS++];\
else if(!feof(stdin)){BUF_SIZE=fread(BUFOR,1,MAX_BUF_SIZE,stdin);\
ZZZ=BUFOR[0];BUF_POS=1;}}
#define GI(WW){do{GET(ZZZ);}while(!isdigit(ZZZ));WW=ZZZ-'0';\
while(1){GET(ZZZ);if(!isdigit(ZZZ))break;WW=WW*10+(ZZZ-'0');}}
#define GC(WW){do{GET(ZZZ);}while(!isalpha(ZZZ));WW=ZZZ;}

//FAST IO

typedef long long int LL;
typedef pair<int,int> PII;
typedef vector<int> VI;

const int MXN = 200010;
const int C = 262144;
const int INF = 1000000001;

int n, m, d;
VI G[MXN];
int deg[MXN];
int active[MXN];

int skl[MXN];
int skla;
int cnt;

int best, num;
VI res;

void dfs(int x) {
	skl[x] = skla;
	cnt++;
	FOREACH(it, G[x])
		if(active[*it] && !skl[*it])
			dfs(*it);
}

int main() {
	scanf("%d %d %d", &n, &m, &d);

	FOR(i, 1, m) {
		int a, b;
		scanf("%d %d", &a, &b);
		G[a].PB(b);
		G[b].PB(a);
		deg[a]++;
		deg[b]++;
	}

	FOR(i, 1, n)
		if(deg[i])
			active[i] = 1;

	queue<int> Q;
		
	FOR(i, 1, n)
		if(deg[i] < d) {
			active[i] = 0;
			Q.push(i);
		}
		
	while(!Q.empty() ) {
		int w = Q.front(); Q.pop();
		FOREACH(it, G[w]) {
			deg[*it]--;
				
			if(deg[*it] < d && active[*it]) {
				active[*it] = 0;
				Q.push(*it);
			}
		}
	}

	FOR(i, 1, n) {
		skla++;
		cnt = 0;
		if(active[i] && !skl[i])
			dfs(i);

		if(cnt > best) {
			best = cnt;
			num = skla;
		}
	}

	if(best == 0) {
		printf("NIE\n");
		return 0;
	}

	FOR(i, 1, n)
		if(skl[i] == num)
			res.PB(i);

	SORT(res);
	printf("%d\n", best);
	FOREACH(it, res)
		printf("%d ", *it);
	printf("\n");

	return 0;
}