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#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int v1[1025],v2[1025],m,n,l[1025][1025],p[1025][1025];
void afisare(int i, int j)
{
if(i>0&&j>0)
if(p[i][j]==1)
{
afisare(i-1,j-1);
fout<<v1[i]<<' ';
}
else if(p[i][j]==2)
afisare(i-1,j);
else afisare(i,j-1);
}
int main()
{
fin>>n>>m;
for(int i=1; i<=n; i++)
fin>>v1[i];
for(int i=1; i<=m; i++)
fin>>v2[i];
for(int i=1; i<=n; i++)
for(int j=1; j<=m; j++)
if(v1[i]==v2[j])
{
l[i][j]=l[i-1][j-1]+1;
p[i][j]=1;
}
else if(l[i-1][j]>l[i][j-1])
{
l[i][j]=l[i-1][j];
p[i][j]=2;
}
else
{
l[i][j]=l[i][j-1];
p[i][j]=3;
}
fout<<l[n][m]<<endl;
afisare(n,m);
return 0;
}