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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int a[257],b[257],c[257],l=1;
int n,m,cont_adv,cont;
int main() {
fin>>n>>m;
for(int i=1;i<=n;i++){
fin>>a[i];
}
for(int i=1;i<=m;i++){
fin>>b[i];
}
for(int i=1;i<=n;i++){
for(int j=1;j<=m;j++){
if(a[i]==b[j]){
cont_adv++;
c[l]=a[i];
l++;
}
}
}
fout<<cont_adv<<endl;
for(int i=1;i<l;i++){
fout<<c[i]<<" ";
}
return 0;
}