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#include<fstream>
long long int a[1025],b[1025],v[1025];
using namespace std ;
ifstream in("cmlsc.in");
ofstream out("cmlsc.out");
int main(){
long long int m,n,l=0;
in>>m>>n;
for(int i=1;i<=m;i++){
in>>a[i];
}
for(int i=1;i<=n;i++){
in>>b[i];
}
for(int i=1;i<=m;i++){
for(int j=1;j<=n;j++){
if(a[i]==b[j]){
l++;
v[l]=a[i];
}
}
}
out<<l<<'\n';
for(int i=1;i<=l;i++){
out<<v[i]<<" ";
}
}