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#include<fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int x[1025],y[1025],c[1025][1025],b[1025][1025],m,n;
void scrie(int i,int j)
{
if (i==0 || j==0);
else
{
if(b[i][j]==1)
{
scrie(i-1,j-1);
fout<<x[i]<<' ';
}
else if(b[i][j]==-1)
scrie(i-1,j);
else scrie(i,j-1);
}
}
int main()
{
int i,j;
fin>>n>>m;
for(i=1;i<=n;i++) fin>>x[i];
for(i=1;i<=m;i++) fin>>y[i];
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
if(x[i]==y[j])
{
c[i][j]=c[i-1][j-1]+1;
b[i][j]=1;
}
else if(c[i-1][j]>=c[i][j-1])
{
c[i][j]=c[i-1][j];
b[i][j]=-1;
}
else
{
c[i][j]=c[i][j-1];
b[i][j]=-2;
}
fout<<c[n][m]<<'\n';
scrie(n,m);
fout.close();
fin.close();
return 0;
}