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#include <fstream>
using namespace std;
int c[1050][1050];
int x[1050];
int v[1050];
int l[1050];
int n,m;
int main()
{
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
fin>>n>>m;
for(int i=1; i<=n; i++)
{
fin>>v[i];
c[i][0]=0;
}
for(int i=1; i<=m; i++)
{
fin>>x[i];
c[0][i]=0;
}
for(int i=1; i<=n; i++)
{
for(int j=1; j<=m; j++)
{
if(v[i]==x[j])
{
c[i][j]=c[i-1][j-1]+1;
}
else
{
c[i][j] = c[i-1][j]>c[i][j-1]?c[i-1][j]:c[i][j-1];
}
}
}
int p=0;
int q=m;
for(int i=n ;i>0;)
{
if(v[i]==x[q])
{
l[++p]=v[i];
i--;
q--;
}
else
{
if(c[i-1][q]>c[i][q-1])
{
i--;
}
else
{
q--;
}
}
}
fout<<p<<"\n";
for(int i=p;i>=1;i--)
{
fout<<l[i]<<" ";
}
return 0;
}