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#include <fstream>
using namespace std;
ofstream fout("cmlsc.out");
int a[1030],b[1030],DP[1030][1030];
void scriere(int i,int j)
{
if(i>0 and j>0)
{
if(a[i]==b[j])
{
scriere(i-1,j-1);
fout<<" "<<a[i];
}
else
{
if(DP[i-1][j]>DP[i][j-1])
scriere(i-1,j);
else
scriere(i,j-1);
}
}
}
int main()
{
ifstream fin("cmlsc.in");
int n,m;
fin>>m>>n;
for(int i=1;i<=m;i++)
fin>>a[i];
for(int i=1;i<=n;i++)
fin>>b[i];
fin.close();
for(int i=1;i<=m;i++)
{
for(int j=1;j<=n;j++)
{
if(i==0 || j==0)
DP[i][j]==0;
else
{
if(a[i]==b[j])DP[i][j]=DP[i-1][j-1]+1;
else
{
DP[i][j]=max(DP[i-1][j],DP[i][j-1]);
}
}
}
}
fout<<DP[m][n]<<"\n";
scriere(m,n);
}