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#include<fstream>
using namespace std;
int main()
{
ifstream intrare("cmlsc.in");
ofstream iesire("cmlsc.out");
int M,N,i,*sir,*nre,i2,max=0,*nr_bune,index=0;
intrare>>M>>N;
sir=new int[M];
nre=new int[N];
nr_bune=new int[N];
for(i=1;i<=M;i++)
intrare>>sir[i];
for(i=1;i<=N;i++)
intrare>>nre[i];
for(i2=1;i2<=N;i2++)
{
for(i=1;i<=M;i++)
{
if(sir[i]==nre[i2])
{
index++;
max++;
nr_bune[index]=sir[i];
}
}
}
iesire<<max<<endl;
if(index!=0)
{
for(i=1;i<=index;i++)
iesire<<nr_bune[i]<<" ";
}
intrare.close();
iesire.close();
return 0;
}