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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int i,j,n,m,mx,p,a[1025],b[1025],g[1025][1025],x[1025];
int main()
{
fin>>n>>m;
for(i=1;i<=n;i++)
{
fin>>a[i];
}
for(i=1;i<=n;i++)
{
fin>>b[i];
}
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
{
if(a[i]==b[j]) g[i][j]=1+g[i-1][j-1];
else
{
if(g[i-1][j]>g[i][j-1]) g[i][j]=g[i-1][j];
else g[i][j]=g[i][j-1];
}
}
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
{
if(g[i][j]>mx)
{
mx=g[i][j];
p++;
x[p]=a[i];
}
}
fout<<mx<<"\n";
for(i=1;i<=p;i++)
fout<<x[i]<<" ";
}