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#include<fstream>
using namespace std;
ifstream fin ("cmlsc.in");
ofstream fout ("cmlsc.out");
int v[1024],w[1024],a[1024][1024],m,n,aux[1024],k;
int maxim(int x, int y)
{
if(x>y)
return x;
return y;
}
int main()
{
fin>>n>>m;
for(int i=1;i<=n;i++)
fin>>v[i];
for(int i=1;i<=m;i++)
fin>>w[i];
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
if(v[i]==w[j])
{
a[i][j]=a[i-1][j-1]+1;
aux[k++]=v[i];
}
else
a[i][j]=maxim(a[i-1][j],a[i][j-1]);
fout<<a[n][m]<<endl;
for(int i=0;i<k;i++)
fout<<aux[i]<<" ";
return 0;
}