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#include <iostream>
#include <fstream>
using namespace std;
unsigned short int a[1024],b[1024],c[1024],m,n,f=0,com;
//ifstream cin("cmlsc.in");
//ofstream cout("cmlsc.out");
int main(){
cin >> m;
cin >> n;
for(int i=0;i<m;i++){
cin >> a[i];
}
for(int i=0;i<n;i++){
cin>> b[i];
}
for(int i=0;i<m;i++){
for(int j=0;j<n;j++){
if(a[i]==b[j]){
com++;
c[f]=b[j];
for(int p=0;p<f;p++){
if(c[p]==c[f]){
com--;
}
}
f++;
}
}
}
cout << com<<"\n";
for(int i=0;i<f;i++){
cout << c[i]<<" ";
}
}