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#include <fstream>
#define nmax 1026
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int a[nmax];
int b[nmax];
int c[nmax][nmax],n,m;
void afis(int i,int j)
{
if(i>n||j>m)
return;
if(a[i]==b[j])
{
fout<<a[i]<<" ";
afis(i+1,j+1);
}
else
{
if(c[i+1][j]>c[i][j+1])
afis(i+1,j);
else
afis(i,j+1);
}
}
int main()
{
fin>>n>>m;
for(int i=1;i<=n;i++)
{
fin>>a[i];
}
for(int j=1;j<=m;j++)
{
fin>>b[j];
}
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
if(a[i]==b[j])
c[i][j]=1+c[i-1][j-1];
else
c[i][j]=max(c[i-1][j],c[i][j-1]);
fout<<c[n][m]<<"\n";
afis(1,1);
return 0;
}