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#include<cstdio>
#include<algorithm>
#include<vector>
#include<set>
#include<map>
#include<queue>
#include<cmath>
#include<iostream>
#include<string>
using namespace std;
#define F first
#define S second
#define MP make_pair
#define PB push_back
#define LL long long
#define PII pair<int, int>
#define PLL pair<LL, LL>
const int M=1000005;

struct eve2
{
	int st, k, bo, ind;
};

struct eve1
{
	int st, en, ind;
};

int n, m, res, prevv;
int R[M], K[M], C[M], rdyk[M], done[M], arr[M];
bool rdy[M];
PII T[M];
vector<eve1> V[M];
vector<eve2> X;
priority_queue<PII> Q, Q2[M];
vector<int> W;
vector<PII> SC;

bool cmp1(eve1 x, eve1 y)
{
	if(x.en==y.en)
		return x.st>y.st;
	return x.en>y.en;
}

bool cmp2(eve2 x, eve2 y)
{
	if(x.st==y.st)
		return x.bo<y.bo;
	return x.st<y.st;
}

bool put(int a, int ind)
{
	while(!Q.empty() && prevv>a)
	{
		if(Q.top().F>prevv)
			return false;
		eve2 x;
		x.st=prevv;
		x.k=ind;
		x.bo=2;
		x.ind=Q.top().S;
	//	printf("lol %d %d %d\n", x.st, x.k, x.ind);
		arr[x.ind]=x.st;
		X.PB(x);
		Q.pop();
		prevv--;
	}
	return true;
}

bool solve1(int ind)
{
	prevv=1000000001;
	while(!Q.empty())
		Q.pop();
	//printf("ind: %d\n", ind);
	for(int i=0; i<(int)V[ind].size(); i++)
	{
		//printf("%d %d %d\n", V[ind][i].st, V[ind][i].en, V[ind][i].ind);
		if(!put(V[ind][i].en, ind))
			return false;
		prevv=min(prevv, V[ind][i].en);
		Q.push(MP(V[ind][i].st, V[ind][i].ind));
	}
	if(!put(0, ind))
		return false;
	return Q.empty();
}

void solve2()
{
	for(int i=0; i<(int)X.size(); i++)
	{
		if(X[i].bo==0)
		{
			//printf("add: %d %d %d\n", X[i].st, X[i].k, X[i].ind);
			rdy[X[i].ind]=1;
			rdyk[X[i].k]++;
			if(rdyk[X[i].k]==1)
				W.PB(X[i].k);
			Q2[X[i].k].push(MP(-arr[X[i].ind], X[i].ind));
		}
		//if(X[i].bo==1)
		//	printf("bo1 %d %d ind: %d %d\n", X[i].st, X[i].k, X[i].ind, R[X[i].ind]);
		//if(X[i].bo==1 && R[X[i].ind]==0)
		//	putall(X[i].st);
		//if(X[i].bo==2)
		//	printf("bo2 %d %d %d done: %d\n", X[i].st, X[i].k, X[i].ind, done[X[i].k]);
		if(X[i].bo==2)
		{
			if(R[X[i].ind]==0)
			{
			//	putall(X[i].st, X[i].ind, X[i].k);
				res++;
			//	printf("qwe=%d ind=%d k=%d\n", X[i].st, X[i].ind, X[i].k);
				vector<int> TM;
				while(!W.empty())
				{
					int v=W[W.size()-1];
					W.pop_back();
					rdyk[v]--;
					if(rdyk[v]>0)
						TM.PB(v);
					if(v!=X[i].k)
					{
						while(R[Q2[v].top().S]!=0)
							Q2[v].pop();
						int u=Q2[v].top().S;
						Q2[v].pop();
						//printf("lol %d %d\n", u, v);
						R[u]=X[i].st;
						//done[v]++;
					}
					else
					{
						R[X[i].ind]=X[i].st;
						//printf("lol %d %d\n", X[i].ind, v);
					}
				}
				W=TM;
			}
		}
	}
}

int main()
{
	//ios_base::sync_with_stdio(0);
	scanf("%d%d", &n, &m);
	for(int i=0; i<n; i++)
	{
		int a, b, c;
		scanf("%d%d%d", &a, &b, &c);
		T[i]=MP(a, b);
		SC.PB(MP(c, i));
	}
	int pre=-1, tmp=0;
	sort(SC.begin(), SC.end());
	for(int i=0; i<n; i++)
	{
		if(SC[i].F!=pre)
		{
			tmp++;
			pre=SC[i].F;
		}
		C[SC[i].S]=tmp;
	}
	for(int i=0; i<n; i++)
	{
		int a=T[i].F, b=T[i].S, c=C[i];
		eve1 x;
		eve2 y;
		K[i]=c;
		x.st=a;
		x.en=b;
		x.ind=i;
		V[c].PB(x);
		y.st=a;
		y.k=c;
		y.bo=0;
		y.ind=i;
		X.PB(y);
	}
	//printf("%d\n", tmp);
	for(int i=1; i<=tmp; i++)
	{
		sort(V[i].begin(), V[i].end(), cmp1);
		if(!solve1(i))
		{
			printf("NIE\n");
			return 0;
		}
	}
	sort(X.begin(), X.end(), cmp2);
	solve2();
	printf("%d\n", res);
	for(int i=0; i<n; i++)
		printf("%d\n", R[i]);
	return 0;
}