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#include <bits/stdc++.h>
using namespace std;
int w[400100]; //wierzchołek
int N[400100]; //next
int V[400100]; //linki do drog
int St[200100]; //stopnie poszczególnych miast
int P[200100]; //parent
int L[200100]; //liczba poszczególnych rodziców
int lindex = 1;
int n, m, d;//n- miasta, m- drogi
void push(int a, int b)
{
	w[lindex] = b;
	N[lindex] = V[a];
	V[a] = lindex;
	++lindex;
	++St[a];
}
int par(int a)
{
	while(P[a] != a)
		a = P[a];
	return a;
}
void uni(int a, int b)
{
	P[par(a)] = P[a] = P[b] = par(b);
}

/*void piszrodzicow()
{
	for(int i = 1; i <= n; ++i)
	{
		printf("%d: ", i);
		if(St[i] == -1)
			printf("-1");
		else
			printf("%d", par(i));
		
		
		printf("\n");
	}
	
}*/
int main()
{
	scanf("%d%d%d", &n, &m, &d);
	
	int a,b;
	for(int i = 0; i < m; ++i)
	{
		scanf("%d%d", &a, &b);
		push(a,b);
		push(b,a);
	}
	queue<int> Q;
	for(int i = 1; i <= n; ++i)
	{
		if(St[i] < d)
		{
			St[i] = -1;
			Q.push(i);
		}
	}
	//puts("C1");
	int T;
	while(!Q.empty())
	{
		T = Q.front();
		Q.pop();
		int i = V[T];
		while(i != 0)
		{
			if(St[w[i]] != -1)
				--St[w[i]];
				
			if(St[w[i]] < d && St[w[i]] != -1)
			{
				St[w[i]] = -1;
				Q.push(w[i]);
			}
			i = N[i];
		}
	}
	//puts("C2");
	for(int i = 1; i <= n; ++i)
		P[i] = i;
	for(int i = 1; i <= n; ++i)
	{
		if(St[i] >= d)
		{
			int j = V[i];
			while(j != 0)
			{
				if(St[w[j]] >= d)
					uni(i, w[j]);
				j = N[j];
			}
		}
	}

	for(int i = 1; i <= n; ++i)
		if(St[i] >= d)
			++L[P[i] = par(i)];
	int max = 0;
	int maxn = 0;
	for(int i = 1; i <= n; ++i)
	{
		if(L[i] > max)
		{
			max = L[i];
			maxn = i;
		}
	}
	if(max == 0)
		puts("NIE");
	else
	{
		printf("%d\n", max);
		for(int i = 1; i <= n; ++i)
		{
			if(St[i] != -1 && P[i] == maxn)
				printf("%d\n", i);
			
		}
	}
	return 0;
}


/*
void write(int a)
{
	int i = V[a];
	while(i != 0)
	{
		printf("%d ", w[i]);
		i = N[i];
	}
}
void wall()
{
	for(int i = 0; i < n; ++i)
	{
		printf("%d: ", i);
		write(i);
		printf("\n");
	}
	
}*/