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#include<fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int a[1027][1027],v[1027],x[1027];
int main()
{
int i,j,n,m,k=1,lin=1;
fin>>n>>m;
for(i=1;i<=n;i++)
fin>>v[i];
for(i=1;i<=m;i++)
fin>>x[i];
for(i=1;i<=m;i++)
for(j=1;j<=n;j++)
if(v[j]==x[i])
a[i][j]=a[i-1][j-1]+1;
else
a[i][j]=max(a[i-1][j],a[i][j-1]);
fout<<a[m][n]<<'\n';
while(lin<=n)
{
for(i=1;i<=m;i++)
if(a[i][lin]==k)
{
fout<<x[i]<<" ";
k++;
}
lin++;
}
}