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//
// Mistrzostwa.cpp : Defines the entry point for the console application.
//

// #include "stdafx.h"


#include <stdio.h>
#include <vector>


using namespace std;


typedef unsigned int uint;


static const int MAX_ITEMS = 200002;


struct WAY
{
	int m_iStart;
	int m_iEnd;

	bool m_fOK;
};


struct WAY_2_DELETE
{
	int m_iStart;
	int m_iWay;
};


struct TOWN
{
	vector<int> m_vWays;

	int m_iSetID;

	bool m_fOK;

	void Init()
	{
		m_iSetID = 0;
		m_fOK    = true;
	}

	int WaysCnt()
	{
		return m_vWays.size();
	}
};


static bool fMaxSetSizeKnown = false;

static int iTownsTotal, iWaysTotal, iLimitD, iTownsLeft, iSetID, iMaxSetID, iMaxSetSize, iSetSize;

static TOWN  aTowns[MAX_ITEMS];

static WAY   aWays[MAX_ITEMS];

static vector<WAY_2_DELETE> vWaysToDelete;

static vector<int> vTownsInSameSet;


static void AddWay(int x, int y, int i)
{
	WAY & w = aWays[i];

	w.m_iStart = x;
	w.m_iEnd   = y;
	w.m_fOK    = true;

	aTowns[x].m_vWays.push_back(i);
	aTowns[y].m_vWays.push_back(i);
}


static void ReadData()
{
	int x, y;

	scanf("%d", &iTownsTotal);

	scanf("%d", &iWaysTotal);

	scanf("%d", &iLimitD);

	iTownsLeft = iTownsTotal;

	for (int i = 1; i <= iTownsTotal; ++i)
	{
		aTowns[i].Init();
	}

	for (int i = 1; i <= iWaysTotal; ++i)
	{
		scanf("%d", &x);

		scanf("%d", &y);

		AddWay(x, y, i);
	}
}


static void PushAllWaysForDeletion(int iTown)
{
	TOWN & t = aTowns[iTown];

	t.m_fOK = false;

	iTownsLeft--;

	for (uint i = 0; i < t.m_vWays.size(); ++i)
	{
		int iWay = t.m_vWays[i];

		if (!aWays[iWay].m_fOK)
			continue;

		aWays[iWay].m_fOK = false;

		WAY_2_DELETE w2d;

		w2d.m_iStart = (aWays[iWay].m_iStart == iTown ? aWays[iWay].m_iEnd : aWays[iWay].m_iStart);
		w2d.m_iWay   = iWay;

		vWaysToDelete.push_back(w2d);
	}
}


static void DeleteWayFromDst(WAY_2_DELETE & w2d)
{
	TOWN & t = aTowns[w2d.m_iStart];

	if (!t.m_fOK)
		return;

	int iFound = -1;

	for (uint i = 0; i < t.m_vWays.size(); ++i)
	{
		if (t.m_vWays[i] == w2d.m_iWay)
		{
			iFound = i;
			break;
		}
	}

	if (iFound == -1)
		return;

	t.m_vWays.erase(t.m_vWays.begin() + iFound);

	if (t.WaysCnt() < iLimitD)
		PushAllWaysForDeletion(w2d.m_iStart);
}


static void Apoptosis(int iTown)
{
	PushAllWaysForDeletion(iTown);

	while (vWaysToDelete.size() != 0)
	{
		WAY_2_DELETE w2d = vWaysToDelete.back();

		vWaysToDelete.pop_back();

		DeleteWayFromDst(w2d);
	}
}


static void Reduce()
{
	for (int i = 1; i <= iTownsTotal; ++i)
	{
		TOWN & t = aTowns[i];

		if (t.m_fOK && t.WaysCnt() < iLimitD)
		{
			Apoptosis(i);
		}
	}
}


static void PushConnectedTowns(int iTown)
{
	TOWN & t = aTowns[iTown];

	if (t.m_iSetID == iSetID)
		return;

	t.m_iSetID = iSetID;

	iSetSize++;

	for (uint i = 0; i < t.m_vWays.size(); ++i)
	{
		int iWay = t.m_vWays[i];

		int iNextTown = (aWays[iWay].m_iStart == iTown ? aWays[iWay].m_iEnd : aWays[iWay].m_iStart);

		if (aTowns[iNextTown].m_iSetID != iSetID)
		{
			vTownsInSameSet.push_back(iNextTown);
		}
	}
}


static void CreateSet(int iTown)
{
	PushConnectedTowns(iTown);

	while (vTownsInSameSet.size() != 0)
	{
		int iNextTown = vTownsInSameSet.back();
		
		vTownsInSameSet.pop_back();

		PushConnectedTowns(iNextTown);
	}
}


static void CreateSets()
{
	fMaxSetSizeKnown = false;

	iSetID = 0;

	for (int i = 1; i <= iTownsTotal; ++i)
	{
		TOWN & t = aTowns[i];

		if (t.m_fOK && t.m_iSetID == 0)
		{
			iSetID++;
			iSetSize = 0;

			CreateSet(i);

			if (!fMaxSetSizeKnown || iSetSize > iMaxSetSize)
			{
				iMaxSetSize = iSetSize;
				iMaxSetID   = iSetID;
				fMaxSetSizeKnown = true;
			}
		}
	}
}


static void PrintOut()
{
	if (!fMaxSetSizeKnown)
	{
		printf("NIE");
		return;
	}

	printf("%d\n", iMaxSetSize);

	for (int i = 1; i <= iTownsTotal; ++i)
	{
		TOWN & t = aTowns[i];

		if (t.m_iSetID == iMaxSetID)
		{
			printf("%d ", i);
		}
	}
}


int main(int argc, char * argv[])
{
//	freopen("sample_input.txt",  "r", stdin);
//	freopen("sample_output.txt", "w", stdout);

	ReadData();

	Reduce();

	CreateSets();

	PrintOut();

	return 0;
}