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#include <stdio.h>
int main ()
{
	int n = 0;
	int m = 0;
	int d = 0;
	scanf("%d", &n);
	scanf("%d", &m);
	scanf("%d", &d);
	int tab[200002];
	for (int i = 0; i < 200002; i++)
	{
		tab[i] = 0;
	}
	int tmp = 0;
	int tmp1 = 0;
	int tmp2 = 0;

	for (int i = 0; i < m; i++)
	{
		scanf("%d", &tmp);
		scanf("%d", &tmp1);
		tab[tmp] = tab[tmp] + 1;
		tab[tmp1] = tab[tmp1] + 1;
	}	
	for (int i = 1; i <= n; i++)
	{
		if (tab[i] >= d)
		{
			tmp2 = tmp2 + 1;
		}
	}
	if (tmp2 >= 3)
	{
		printf("%d\n",tmp2);
		for (int i = 1; i <= n; i++)
		{
			if (tab[i] >= d)
			{
				printf("%d ",i);
			}
		}
	}
	else
		printf("NIE");
	printf("\n");
}