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#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int i,j,x[1025],y[1025],a[1025][1025],n,m,sol[1025];
void cmslc()
{
int i,j;
for(i=1; i<=n; i++)
for(j=1; j<=m; j++)
if(x[i]==y[j])
a[i][j]=1+a[i-1][j-1];
else
a[i][j]=max( a[i-1][j], a[i][j-1] );
}
void afis()
{
int l=a[n][m];
fout<<l<<'\n';
int i=n;j=m;
while(l)
if(x[i]==y[j])
{
sol[l]=x[i];
l--;
i--;
j--;
}
else
{
if(a[i-1][j]<a[i][j-1])j--;
else i--;
}
for(int k=1;k<=a[n][m];k++)
fout<<sol[k]<<" ";
}
int main()
{
fin>>n>>m;
for(i=1;i<=n;i++)fin>>x[i];
for(j=1;j<=m;j++)fin>>y[j];
a[0][0]=0;
cmslc();
afis();
return 0;
}