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#include <iostream>
#include <cstdio>
using namespace std;
int a[1050],b[1050],n,m,d[1030][1030],sir[1030],nr=0;
void citire()
{
scanf("%d %d",&n,&m);
for(int i=1;i<=n;i++)
scanf("%d",&a[i]);
for(int i=1;i<=m;i++)
scanf("%d",&b[i]);
}
void matrice()
{
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
{
if(a[i]==b[j])
d[i][j]=d[i-1][j-1]+1;
else
d[i][j]=max(d[i-1][j],d[i][j-1]);
}
for(int i=n,j=m;i;)
{
if(a[i]==b[j])
{
sir[++nr]=a[i];
i--;
j--;
}
else
if(d[i-1][j]<d[i][j-1])
j--;
else
i--;
}
}
void afisare()
{
printf("%d \n",nr);
for(int i=nr;i>=1;i--)
printf("%d ",sir[i]);
}
int main()
{
freopen("cmlsc.in","r",stdin);
freopen("cmlsc.out","w",stdout);
citire();
matrice();
afisare();
//cout << "Hello world!" << endl;
return 0;
}