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#include <iostream>
#include <fstream>
using namespace std;
long a[1025],b[1025],M,N,i,j,MAX,c[1025],t;
int main()
{
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
fin>>M>>N;
MAX=0;
for (i=1; i<=M; i++)
fin>>a[i];
for (i=1; i<=N; i++)
fin>>b[i];
for (i=1; i<=M ;i++)
for (j=1; j<=N; j++)
if (a[i]==b[j])
{
t++;
c[t]=a[i];
MAX++;
break;
}
fout<<MAX<<endl;
for (i=1;i<=t;i++)
fout<<c[i]<<" ";
return 0;
}