#include <cstdio>
#include <cstring>
#include <vector>

using namespace std;

#define file_in "santa.in"
#define file_out  "santa.out"


#define Nmax 45010
#define pb push_back

int N,M;
int a,b;
vector<int> v[Nmax];
int nr,A[Nmax];
int Q,E,S;
int viz[Nmax];

void dfs(int nod)
{
	int i;
	
	viz[nod]=1;
	
	
	for (i=0;i<v[nod].size();++i)
		 if (!viz[v[nod][i]])
		 {
			 nr++;
			 A[nr]=v[nod][i];
			 dfs(v[nod][i]);
		 }
}

int main()
{
	int i;
	
	freopen(file_in,"r",stdin);
	freopen(file_out,"w",stdout);
	
	scanf("%d %d", &N,&M);
	
	while(M--)
	{
		scanf("%d %d", &a, &b);
		
		v[a].pb(b);
		v[b].pb(a);
		
	}
	
	scanf("%d %d %d", &S, &E, &Q);
	
	//primele doua valori vor fi Q si S
	//ultima valoare va fi E
	
	A[1]=Q;
	A[2]=S;
	nr=2;
	viz[Q]=1;
	viz[S]=1;
	
	dfs(S);
		
    printf("%d\n", nr);
	
	for (i=1;i<=nr;++i)
		 printf("%d ", A[i]);
	
	fclose(stdin);
	fclose(stdout);
	
	return 0;
}