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