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#include <fstream>
using namespace std;
ifstream f ("cmlsc.in");
ofstream g ("cmlsc.out");
int n,m,i,j,x[1025],y[1025],a[1025][1025],sir[1025],k;
int main()
{
f>>n>>m;
for(i=1;i<=n;i++)
f>>x[i];
for(i=1;i<=m;i++)
f>>y[i];
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
if(x[i]==y[j])
a[i][j]=a[i-1][j-1]+1;
else a[i][j]=max(a[i][j-1],a[i-1][j]);
g<<a[n][m]<<endl;
i=n;j=m;
while(i && j)
{
if(x[i]==y[j])sir[++k]=x[i],i--,j--;
else
{
if(a[i][j-1]>a[i-1][j])j--;
else i--;
}
}
for(i=k;i>=1;i--)
g<<sir[i]<<" ";
return 0;
}