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#include <iostream>
#include <vector>
using namespace std;
int main()
{
int v1[1023];
vector<int> v2;
int m, n, a;
cin>>m>>n;
for(int i = 0; i < m; i++)
{
cin>>v1[i];
}
for(int i = 0; i < n; i++)
{
cin>>a;
for(int i = 0; i < m; i++)
{
if(v1[i] == a) v2.push_back(a);
}
}
cout<<v2.size()<<endl;
for(int i = 0; i < v2.size(); i++)
{
cout<<v2[i]<<" ";
}
return 0;
}