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#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int main(){
int m,n,d=0;
fin >> m >> n;
int x[m],y[n],c[256];
for(int i=0;i<m;i++)
fin >> x[i];
for(int j=0;j<n;j++)
fin >> y[j];
for(int a=0;a<m;a++){
for(int b=0;b<n;b++){
if(x[a] == y[b]){
c[d] = x[a];
d++;
}
}
}
fout << d << "\n";
for(int p=0;p<d;p++)
fout << c[p] << " ";
return 0;
}