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#include <fstream>
#include <cmath>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n,m,i,j,a[1030],b[1030],d[1030][1030],sir[1030],k;
int main()
{
fin>>n>>m;
for(i=1;i<=n;i++)
fin>>a[i];
for(i=1;i<=m;i++)
fin>>b[i];
for(i=1;i<=n;i++)
{
for(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(i=n,j=m;i;)
{
if(a[i]==b[j])
{
sir[++k]=a[i];
i--;j--;
}
else
{
if(d[i-1][j]>=d[i][j-1])
i--;
else j--;
}
}
fout<<k<<'\n';
for(i=k;i>=1;i--){
fout<<sir[i];
if(i!=1)
fout<<' ';
}
return 0;
}