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#include<fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
unsigned m,n,i,j,k,s[1025],v1[1025],v2[1025],d[1025][1025];
int main()
{
fin>>m>>n;
for(i=1;i<=m;i++)
{
fin>>v1[i];
}
for(j=1;j<=n;j++)
{
fin>>v2[j];
}
for(i=1;i<=m;i++)
{
for(j=1;j<=n;j++)
{
if(v1[i]==v2[j])
{
d[i][j]=d[i-1][j-1]+1;
}
else
{
d[i][j]=max(d[i-1][j],d[i][j-1]);
}
}
}
for(i=m,j=n;i;)
{
if(v1[i]==v2[j])
{
s[++k]=v1[i];
i--;
j--;
}
else if(d[i-1][j]<d[i][j-1])
j--;
else
i--;
}
fout<<d[m][n]<<"\n";
for(i=k;i>0;--i)
{
fout<<s[i]<<" ";
}
return 0;
}