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#include<bits/stdc++.h>
using namespace std;

struct Para{
    int x, y;
    bool operator<( const Para &o )const{
        if( x!=o.x ) return x<o.x;
        if( y!=o.y ) return y<o.y;
        return false;
    }
};

int n, m, k, a, b, odw[200111], w[200111], akt = 1;
set<int> s[200111];
set<Para> p;
queue<int> Q;

int main()
{
    scanf("%d%d%d", &n, &m, &k);
    for( int i = 0; i<m; i++ ){
        scanf("%d%d", &a, &b);
        s[a].insert(b);
        s[b].insert(a);
    }

    for( int i = 1; i<=n; i++ )
        p.insert({s[i].size(), i});

    set<int>::iterator iTs;

    while( !p.empty() && p.begin()->x<k){
        int X = p.begin()->x;
        int Y = p.begin()->y;
        for( iTs = s[Y].begin(); iTs!=s[Y].end(); iTs++ ){

            if( s[*iTs].size()-1 > 0 )
                p.insert({s[*iTs].size()-1, *iTs});

            if( p.find({s[*iTs].size(), *iTs})!=p.end() )
                p.erase(p.find({s[*iTs].size(), *iTs}));

            if( s[*iTs].find(Y)!=s[*iTs].end() )
                s[*iTs].erase(s[*iTs].find(Y));
        }
        s[Y].clear();
        if( p.find({X, Y})!=p.end() )
           p.erase(p.find({X, Y}));
    }
    int l = 1;
    int a = 0;
    int mx = 0;
    for( int i = 1; i<=n; i++ ){
        if( odw[i]!=0 ) continue;
        Q.push(i);
        odw[i] = akt;
        l = 1;
        while( !Q.empty() ){
            int w = Q.front(); Q.pop();
            for( iTs = s[w].begin(); iTs!=s[w].end(); iTs++ ){
                if( odw[*iTs]==0 ){
                    odw[*iTs] = akt;
                    Q.push(*iTs);
                    l++;
                }
            }
        }
        if( l>mx ){
            mx = l;
            a = akt;
        }
        akt++;
    }
    if( p.empty() ){
        printf("NIE");
        return 0;
    }
    printf("%d\n", mx);
    for( int i = 1; i<200111; i++ )
        if( odw[i]==a )
            printf("%d ", i);
    return 0;
}