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#include <iostream>
#include<fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int main()
{
int n,m,a[10025],b[10025],c[10025];
fin>>m>>n;
for(int i=1;i<=m;i++)
fin>>a[i];
for(int i=1;i<=n;i++)
fin>>b[i];
int d=0;
for(int i=1;i<=m;i++){
for(int j=1;j<=n;j++){
if(a[i]==b[j]){
d++;
c[d]=a[i];
}
}
}
fout<<d<<'\n';
for(int i=1;i<=d;i++)
fout<<c[i]<<" ";
return 0;
}