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#include <iostream>
#include <fstream>
#include <vector>
using namespace std;
ifstream f ("cmlsc.in");
ofstream g ("cmlsc.out");
int mat[1025][1025];
int sir1[1025],sir2[1025];
vector <int> sub;
int main()
{
int n,m;
f>>n;
f>>m;
for (int i=1; i<=n; i++)
{
f>>sir1[i];
}
for (int i=1; i<=m; i++)
{
f>>sir2[i];
}
for (int i=1; i<=m; i++)
{
for (int j=1; j<=n; j++)
{
if (sir1[j]==sir2[i])
{
mat[i][j]=mat[i-1][j-1]+1;
sub.push_back(sir1[j]);
}
else
mat[i][j]=max(mat[i][j-1],mat[i-1][j]);
}
}
g<<mat[m][n]<<'\n';
for (int i=0; i<sub.size();i++)
{
g<<sub[i]<<" ";
}
f.close();
g.close();
return 0;
}