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