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#include <fstream>
using namespace std;
int k=0,sb[1030],m,n,a[1030],b[1030],cnt=0;
int main()
{
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
fin>>m>>n;
{
for(int i=1; i<=m; i++) fin>>a[i];
for(int i=1; i<=n; i++)
{
fin>>b[i];
for(int j=1; j<=m; j++)
{
if(b[i]==a[j])
{
cnt++;
if(cnt==1)
{
k++;
sb[k]=a[j];
}
}
}
}
fout<<k<<"\n";
for(int j=1; j<=k; j++) fout<<sb[j]<<" ";
return 0;
}
}