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#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n,i,j,l[100001],k,a[1025][1025],b[100001];
long v[100001],m;
int main()
{
k=1;
fin>>n>>m;
a[1][1]=0;
for(i=1;i<=n;i++)
fin>>v[i];
for(i=1;i<=m;i++)
fin>>b[i];
for(i=1;i<=m;i++)
for(j=1;j<=n;j++)
if(v[j]==b[i])
{a[i][j]+=k;k++;}
fout<<a[m][n]<<endl;
for(i=1;i<=m;i++)
for(j=1;j<=n;j++)
if(a[i][j]!=0)
fout<<b[i]<<" ";
return 0;
}