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#include <bits/stdc++.h>

#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define FORD(i, a, b) for(int i = (a); i >= (b); --i)
#define VAR(v, i) __typeof(i) v=(i)
#define FORE(i, c) for(VAR(i, (c).begin()); i != (c).end(); ++i)
#define all(v) (v).begin(),(v).end()

#define VI vector<int>
#define PII pair<int,int>
#define st first
#define nd second
#define mp make_pair
#define pb push_back
#define lint long long int

#define debug(x) {cerr <<#x <<" = " <<x <<endl; }
#define debug2(x,y) {cerr <<#x <<" = " <<x << ", "<<#y<<" = "<< y <<endl; } 
#define debug3(x,y,z) {cerr <<#x <<" = " <<x << ", "<<#y<<" = "<< y << ", " << #z << " = " << z <<endl; } 
#define debugv(x) {{cerr <<#x <<" = "; FORE(itt, (x)) cerr <<*itt <<", "; cerr <<endl; }}
#define debugt(t,n) {{cerr <<#t <<" = "; FOR(it,0,(n)) cerr <<t[it] <<", "; cerr <<endl; }}

#define make( x) int (x); scanf("%d",&(x));
#define make2( x, y) int (x), (y); scanf("%d%d",&(x),&(y));
#define make3(x, y, z) int (x), (y), (z); scanf("%d%d%d",&(x),&(y),&(z));
#define make4(x, y, z, t) int (x), (y), (z), (t); scanf("%d%d%d%d",&(x),&(y),&(z),&(t));
#define makev(v,n) VI (v); FOR(i,0,(n)) { make(a); (v).pb(a);} 
#define IOS ios_base::sync_with_stdio(0)
#define HEAP priority_queue

#define read( x) scanf("%d",&(x));
#define read2( x, y) scanf("%d%d",&(x),&(y));
#define read3(x, y, z) scanf("%d%d%d",&(x),&(y),&(z));
#define read4(x, y, z, t) scanf("%d%d%d%d",&(x),&(y),&(z),&(t));
#define readv(v,n) FOR(i,0,(n)) { make(a); (v).pb(a);}

using namespace std;

int n, m, d;

const int max_n = 200005;

VI g[max_n];
VI g2[max_n];
int deg[max_n];
int jest[max_n];
int ile[max_n];

VI que;
int start = 0;

int kolor[max_n];

void dfs(int v, int kl){
  kolor[v] = kl;
  ile[kl]++;
  FORE(i,g2[v]){
    int w = *i;
    if (kolor[w] == -1){
      dfs(w, kl);
    }
  }
}

int main(){
  scanf("%d%d%d", &n, &m, &d);
  FOR(i,0,n) deg[i] = 0;
  FOR(i,0,n) jest[i] = 1;
  FOR(i,0,m){
    make2(a,b);
    a--, b--;
    g[a].pb(b); g[b].pb(a);
    deg[a]++; deg[b]++;
  }
  FOR(i,0,n){
    if (deg[i] < d){
      que.pb(i);
      jest[i] = 0;
    }
  }

  while(start != que.size()){
    int v = que[start];
    FORE(i,g[v]) {
      deg[*i]--;
      if( jest[*i]==1 && deg[*i] < d ) {
        jest[*i] = 0;
        que.pb(*i);
      }
    }
    start++;
  }
  VI vert;
  FOR(i,0,n) if(jest[i]){
    vert.pb(i);
  }
  
  if(vert.size()==0){
    printf("NIE\n");
    return 0;
  }
  FORE(i,vert){
    FORE(j,g[*i]){
      if(jest[*j] == 1) g2[*i].pb(*j);
    }
  }
  
  FOR(i,0,n+1) kolor[i] = -1;
  FOR(i,0,n+1) ile[i] = 0;

  int lk = -1;
  FORE(i,vert){
    int v = *i;
    if(kolor[v]==-1){
      lk++;
      dfs(v, lk);
    }
  }

  int best = 0;
  int dla = -1;
  FOR(i,0,lk+1){
    if(ile[i]>best){
      best = ile[i];
      dla = i;
    }
  }
  
  VI answer;
  FORE(i,vert){
    if(kolor[*i]==dla) answer.pb((*i)+1);
  }
  printf("%d\n",answer.size());
  sort(answer.begin(),answer.end());
  FOR(i,0,answer.size()){
    printf("%d ", answer[i]);
  }
  printf("\n");
  

  

  
}