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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int d[10][10],n,m,a[1025],b[1025];
void afisare(int i, int j)
{
if (d[i][j]==0)
return;
if (a[i]==b[j])
{
afisare(i-1,j-1);
fout<<a[i]<<" ";
return;
}
if (d[i-1][j] > d[i][j-1])
afisare(i-1,j);
else
afisare(i,j-1);
}
int main()
{
fin>>n>>m;
for(int i=1;i<=n;i++)
fin>>a[i];
for(int i=1;i<=m;i++)
fin>>b[i];
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
{
if(a[i]==b[j])
d[i][j]=1+d[i-1][j-1];
if(a[i]!=b[j])
d[i][j]=max(d[i-1][j], d[i][j-1]);
}
fout<<d[n][m]<<'\n';
afisare(n,m);
return 0;
}