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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int main()
{
short n,m,a[1024],b[1024],c[1024],t=0;
fin>>n>>m;
for(int i=0;i<n;i++) fin>>a[i];
for(int i=0;i<m;i++) fin>>b[i];
fin.close();
for(int i=0;i<n;i++)
for(int j=0;j<m;j++){
if(a[i]==b[j]){
c[t]=a[i];
t++;
break;
}
}
fout<<t<<endl;
for(int i=0;i<t;i++){
fout<<c[i]<<" ";
}
return 0;
}