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#include <fstream>
#include <algorithm>
using namespace std;
ifstream in ("cmlsc.in");
ofstream out ("cmlsc.out");
int n,m,v[1025][1025],a[1050],b[1050],k;
void afs(int i,int j)
{
if(i*j)
if(a[i]==b[j])
{
afs(i-1,j-1);
out<<a[i]<<" ";
}
else
if(v[i][j]==v[i-1][j])
afs(i-1,j);
else
afs(i,j-1);
}
int main()
{
int i,j;
in>>n>>m;
for(i=1;i<=n;i++)
in>>a[i];
for(i=1;i<=m;i++)
in>>b[i];
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
if(a[i]==b[j])
v[i][j]=v[i-1][j-1]+1;
else
v[i][j]=max(v[i][j-1],v[i-1][j]);
out<<v[n][m]<<"\n";
afs(n,m);
return 0;
}