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#include <iostream>
#include <vector>
void usuwanie_drogi(std::vector <std::vector <int> >& siec,int a,int b,int d,int *siz)
{
    int k=0;
    while(siec.at(a).at(k)!=b)
        k++;
    siec.at(a).at(k)=0;
    siz[a]--;
    k=0;
    while(siec.at(b).at(k)!=a)
        k++;
    siec.at(b).at(k)=0;
    siz[b]--;
    k=0;
    if(siz[a]<d)
    {
        while(siz[a]>0)
        {
            if(siec.at(a).at(k)!=0)
                usuwanie_drogi(siec,a,siec.at(a).at(k),d,siz);
            else
                k++;
        }
    }
    k=0;
    if(siz[b]<d)
    {
        while(siz[b]>0)
        {
            if(siec.at(b).at(k)!=0)
                usuwanie_drogi(siec,b,siec.at(b).at(k),d,siz);
            else
                k++;
        }
    }
}
int main()
{
    int m,n,d,ta,tb;
    std::cin>>n>>m>>d;
    std::vector <std::vector <int> > siec (n+1);
    int siz[n+1];
    int i=0;
    for(i=1; i<=n; i++)
        siz[i]=0;
    while(m>0)
    {
        std::cin>>ta>>tb;
        siec[ta].push_back(tb);
        siec[tb].push_back(ta);
        siz[ta]++;
        siz[tb]++;
        m--;
    }
    for(i=1; i<=n; i++)
    {
        ta=0;
        if(siz[i]<d && siz[i]!=0)
        {
            while(siec.at(i).at(ta)==0)
                ta++;
            usuwanie_drogi(siec,i,siec.at(i).at(ta),d,siz);
        }
    }
    ta=0;
    for(i=1; i<=n; i++)
    {
        if(siz[i]!=0)
            ta++;
    }
    if(ta==0)
    {
        std::cout<<"NIE";
        return 0;
    }
    std::cout<<ta<<std::endl;
    for(i=1; i<=n; i++)
    {
        if(siz[i]!=0)
            std::cout<<i<<" ";
    }
    return 0;
}