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#include <iostream>
#include <fstream>
using namespace std;
ifstream in("cmlsc.in");
ofstream out("cmlsc.out");
int a[100],b[100],c[100],n,m,viz[100];
void bkt()
{
int i,j,p=0;
for(i=1;i<=m;i++)
for(j=1;j<=n;j++)
{
if(a[i]==b[j]&&viz[a[i]]==0)
{
p++;
c[p]=a[i];
viz[a[i]]=1;
i++;
}
}
out<<p<<"\n";
for(i=1;i<=p;i++)
out<<c[i]<<" ";
}
int main()
{
in>>m>>n;
for(int i=1;i<=m;i++)
in>>a[i];
for(int i=1;i<=n;i++)
in>>b[i];
bkt();
return 0;
}