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#include <cstdio>
#include <algorithm>
using namespace std;
int a[1025],b[1025],n,m,mat[1025][1025];
void citire()
{
int i;
scanf("%d%d",&n,&m);
for(i=1;i<=n;i++)
scanf("%d",&a[i]);
for(i=1;i<=m;i++)
scanf("%d",&b[i]);
}
void subsir()
{
int i,j;
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
if(a[i]==b[j])
mat[i][j]=mat[i-1][j-1]+1;
else mat[i][j]=max(mat[i-1][j],mat[i][j-1]);
}
void afisare(int i, int j)
{
if(i<1 || j<1)
return;
if(a[i]==b[j])
{
afisare(i-1,j-1);
printf("%d ",a[i]);
}
else if(mat[i-1][j]>mat[i][j-1])
afisare(i-1,j);
else afisare(i,j-1);
}
int main()
{
freopen("cmlsc.in","r",stdin);
freopen("cmlsc.out","w",stdout);
citire();
subsir();
printf("%d\n",mat[n][m]);
afisare(n,m);
return 0;
}