#include<bits/stdc++.h>
using namespace std;
#define xx first
#define yy second
#define gc getchar_unlocked

template<typename T> T getint() {
	T val=0;
	char c;
	
	bool neg=false;
	while((c=gc()) && !(c>='0' && c<='9')) {
		neg|=c=='-';
	}

	do {
		val=(val*10)+c-'0';
	} while((c=gc()) && (c>='0' && c<='9'));

	return val*(neg?-1:1);
}

struct el {
    int from,to,ind;
};

const int MAXN=50001;
const int MAXM=600001;

bool isc[MAXM];
vector<el> adj[MAXN];

int st[MAXN], par[MAXN];
int ans[MAXN];
int active[MAXN];
void dfs(int x, bool have=false) {
    st[x]=1;
    if(have) ans[x]=1;
    for(auto i:adj[x]) {
        if(par[x]!=i.to) isc[i.ind]|=have;
        
        if(!st[i.to]) {
            bool volt=isc[i.ind]==false;
            par[i.to]=x;
            active[x]=i.ind;
            dfs(i.to, have|isc[i.ind]);
            if(volt && isc[i.ind]) {
                st[i.to]=0;
                dfs(i.to, true);
            }
            active[x]=-1;
        }else if(have && par[x]!=i.to) {
            isc[active[i.to]]=true;
        }
    }
    
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    
    int n,m,k;
    n=getint<int>();
    m=getint<int>();
    k=getint<int>();
    for(int i=0;i<m;++i) {
        int a,b;
        a=getint<int>();
        b=getint<int>();
        isc[i]=i<k;
        adj[a].push_back(el{a,b,i});
        adj[b].push_back(el{b,a,i});
    }
    
    dfs(1);
    for(int i=1;i<=n;++i) st[i]=0;
    dfs(1);
    
    
    vector<int> res;
    for(int i=1;i<=n;++i) if(ans[i]) res.push_back(i);
    cout<<res.size()<<"\n";
    for(auto i:res) cout<<i<<" ";
    cout<<"\n";
    
    
    return 0;
}