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