#include<fstream.h>
ifstream f("party.in");
ofstream g("party.out");
int viz[100],n,m;
void citire()
	{
	int x,y,c,i;
	f>>n>>m;
	for(i=1;i<=m;i++)
		{
		f>>x>>y>>c;
		switch(c)
			{
			//case 0:viz[x]=viz[y]=0;break;
			case 1:if(viz[x])viz[y]=0;break;
			case 2:if(viz[y])viz[x]=0;break;
			case 3:if(!viz[x])
								viz[y]=1;
							else
							if(!viz[y])viz[x]=1;break;
			}
		}
	}
int main()
{
citire();f.close();
int i;
g<<"ceva\n";
for(i=1;i<=n;i++)
	if(!viz[i])g<<i<<" ";
g.close();
return 0;
}